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Nervous System

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Chapter 10
Nervous System

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Learning Objectives

  • Name, locate, and describe the functions of the major organs and parts of the nervous system.
  • Recognize nervous system combining forms and make terms using them with new and familiar suffixes.
  • Define several pathological conditions affecting the nervous system.

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Learning Objectives (cont’d.)

  • Describe some laboratory tests, clinical procedures, and abbreviations that pertain to the system.
  • Apply your new knowledge to understanding medical terms in the proper contexts, such as medical reports and records.

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Chapter 10
Lesson 10.1

 

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Introduction

Nervous system:

  • Complex: 100 billion nerve cells
  • Voluntary and involuntary functions
  • Nerves carry electrical messages
  • External and internal receptors

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What are external stimuli?

How can internal chemicals be stimuli?

What are some of the involuntary body functions controlled by the nervous system?

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Introduction (cont’d.)

Nerve cells (neurons):

  • Microscopic
  • Collected into macroscopic nerves
  • Carry electrical messages all over the body

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Internal and external stimuli activate the cell membranes to release stored electrical energy called the nervous impulse.

External and internal receptors receive and transmit these impulses to the brain and spinal cord (central nervous system).

The central nervous system recognizes, interprets, and relays impulses to other nerve cells that extend through parts of the body such as muscles, glands, and organs.

What is the scope of influence nerve cells have on bodily function?

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General Structure of the Nervous System

Two major divisions:

  • Central nervous system
  • Brain
  • Spinal cord
  • Peripheral nervous system
  • cranial nerves
  • spinal nerves
  • Autonomic nervous system

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Cranial nerves carry electrical impulses between the brain and the head and neck (except vagus nerve).

Spinal nerves carry impulses between the spinal cord and the chest, abdomen, and extremities.

Why is the 10th cranial nerve called the vagus nerve? What does it do?

 

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General Structure of the Nervous System (cont’d.)

  • Cranial and spinal nerves
  • Sensory nerves carry messages toward the brain (afferent)
  • Motor nerves carry messages from the brain (efferent).
  • Mixed nerves carry both sensory and motor fibers.
  • Sensory receptors

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What is the difference between voluntary and involuntary functioning?

What are parasympathetic and sympathetic nerves?

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General Structure of the Nervous System (cont’d.)

Autonomic nervous system:

  • Carries impulses from the central nervous system to organs.
  • Sympathetic nerves stimulate body under stress.
  • Parasympathetic nerves balance sympathetic system.
  • Slow heart rate
  • Lower blood pressure

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The autonomic nervous system contains a large group of nerves that function automatically.

It controls heart, blood vessels, glands, and involuntary muscles like intestines, and hollow organs such as stomach and urinary bladder.

Why is the autonomic nervous system necessary?

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Divisions of the Central and Peripheral Nervous System

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How are stimuli processed by the nervous system?

What are the parenchymal cells of the nervous system?

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Neurons, Nerves, and Glia

Neuron = individual nerve cell

  • Dendrites
  • Cell nucleus
  • Axon
  • Myelin sheath
  • Terminal end fibers (secrete neurotransmitters)
  • Neurotransmitters (transfer impulse across synapse)

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What structure carries the nerve impulse away from the cell body?

What substances are examples of neurotransmitters?

What is the singular form of “ganglia”?

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Neurons, Nerves, and Glia (cont’d.)

Label the parts of a neuron and review the path of a nervous impulse.

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Answers are on the next slide.

What are the parts of the neurons shown in this slide?

What structures comprise the parenchymal cells of the nervous system?

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Neurons, Nerves, and Glia (cont’d.)

Image shows the parts of a neuron. Review the path of a nervous impulse.

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What are the parts of the neurons shown in this slide?

What structures comprise the parenchymal cells of the nervous system?

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Neurons, Nerves, and Glia (cont’d.)

Glia cells:

  • Maintain health of nervous system
  • Do not transmit impulses

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How do the glia cells keep the nervous system healthy?

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Neurons, Nerves, and Glia (cont’d.)

Four types:

  • Astrocytes (astroglial cells)
  • Microglia (microglial cells)
  • Oligodendroglia (oligodendroglial cells)
  • Ependymal Cells

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These are the supportive, protective, and connective cells of the central nervous system.

(recap) What purpose does stromal tissue serve?

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Chapter 10
Lesson 10.2

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The Brain

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The Cerebrum

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The brain is divided into right and left hemispheres.

The brain consists of four major lobes, including the frontal lobe, parietal lobe, temporal lobe, and occipital lobe.

What are the parts of the left cerebral hemisphere as shown in the diagram?

What primary functions are carried out by the different lobes of the brain?

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The Brain (cont’d.)

  • Cerebrum
  • Largest section of brain
  • Surface has nerve cells called cerebral cortex (sulci are grooves, gyri are folds).
  • Manages speech, vision, smell, movement, hearing, and thought
  • 4 lobes: Frontal, Occipital, Parietal, Temporal

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What is the purpose of the cerebral cortex?

How many major divisions can be applied to the entire cerebral cortex?

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The Brain (cont’d.)

  • Cerebellum
  • Coordinates voluntary movements
  • Maintains balance
  • Thalamus
  • Integrates and monitors impulses from skin (pain)

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What is the value of the ability to sense pain?

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The Brain (cont’d.)

  • Hypothalamus
  • Controls body temperature, sleep, appetite, sexual desire, and emotions
  • Regulates release of hormones from pituitary gland
  • Monitors sympathetic and parasympathetic nervous systems

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How do messages travel from one side of the brain to another?

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The Brain (cont’d.)

The Brainstem

  • Pons
  • Bridges cerebrum and cerebellum with rest of the brain
  • Houses nerves for face and eyes

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The Brain (cont’d.)

The Brainstem

  • Medulla oblongata
  • Connects spinal cord to brain
  • Nerve tracts cross from side to side
  • Regulates:

Blood vessels

Heart

Respiratory system

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How does the word “crossover” apply to a function of the medulla oblongata?

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The Spinal Cord and Meninges

Spinal cord

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The spinal cord is the column of nervous tissue from the medulla oblongata to second lumbar vertebra.

It serves as a pathway for impulses to and from the brain.

The inner section of the cross-section of the spinal cord is gray matter.

The outer section of the cross-section of the spinal cord is white matter.

What is the difference between efferent and afferent neurons?

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The Spinal Cord and Meninges (cont’d.)

Meninges

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Meninges are the three layers of connective tissue membranes that surround the brain and spinal cord.

What is the function of the outer dura mater? (channels blood to brain tissue)

What fluid lies between the arachnoid membrane and the subarachnoid space?

The inner pia mater offers a rich supply of blood vessels.

Where are the layers of the meninges in the figure?

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The Spinal Cord and Meninges (cont’d.)

Meninges

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Meninges are the three layers of connective tissue membranes that surround the brain and spinal cord.

What is the function of the outer dura mater? (channels blood to brain tissue)

What fluid lies between the arachnoid membrane and the subarachnoid space?

The inner pia mater offers a rich supply of blood vessels.

Where are the layers of the meninges in the figure?

Meninges

    • Dura mater
    • Arachnoid membrane
    • Pia mater

 

 

  • CSF= Cerebrospinal fluid

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VOCABULARY

  • acetylcholine
  • afferent nerves
  • arachnoid membrane
  • astrocyte
  • autonomic nervous system

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Reference pages 260-262 for definitions of vocabulary terms

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  • axon
  • blood-brain barrier
  • brainstem
  • cauda equina
  • cell body

VOCABULARY

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Reference pages 260-262 for definitions of vocabulary terms

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  • central nervous system
  • cerebellum
  • cerebral cortex
  • cerebrospinal fluid (CSF)
  • cerebrum

VOCABULARY

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Reference pages 260-262 for definitions of vocabulary terms

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  • dendrite
  • dura mater
  • ependymal cell
  • efferent nerves
  • ganglion/ganglia
  • glial cells
  • gyrus

VOCABULARY

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Reference pages 260-262 for definitions of vocabulary terms

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  • hypothalamus
  • medulla oblongata
  • meninges
  • microglial cell
  • motor nerves
  • myelin sheath

VOCABULARY

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Reference pages 260-262 for definitions of vocabulary terms

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  • nerve
  • neuron
  • neurotransmitter
  • oligodendroglial cell
  • parasympathetic nerves
  • parenchyma
  • peripheral nervous system

VOCABULARY

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Reference pages 260-262 for definitions of vocabulary terms

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  • pia mater
  • plexus
  • pons
  • receptor
  • sciatic nerve
  • sensory nerves
  • spinal nerves

VOCABULARY

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Reference pages 260-262 for definitions of vocabulary terms

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  • stimulus/stimuli
  • stroma
  • sulcus
  • sympathetic nerves
  • synapse
  • thalamus
  • Vagus nerve
  • ventricles of the brain

VOCABULARY

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Reference pages 260-262 for definitions of vocabulary terms

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QUICK QUIZ:

1. A sheet of nerve cells that produces a rounded fold on the surface of the cerebrum

 

A. microglial

B. gyrus

C. parenchyma

D. stroma

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CORRECT Answer is B, gyrus

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2. The thin, delicate inner membrane of the meninges

 

A. pia mater

B. dura mater

C. parenchyma

D. stroma

QUICK QUIZ:

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CORRECT Answer is A, pia mater

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COMBINING FORMS
AND TERMINOLOGY

ORGANS AND STRUCTURES

 

  • cerebell/o cerebellum
  • cerebr/o cerebrum
  • dur/o dura mater
  • encephal/o brain
  • gli/o glial cells

Combining Form Meaning

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ORGANS AND STRUCTURES

 

  • lept/o thin, slender
  • mening/o, meningi/o membranes, meninges
  • my/o muscle
  • myel/o spinal cord
  • neur/o nerve

Combining Form Meaning

COMBINING FORMS
AND TERMINOLOGY

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ORGANS AND STRUCTURES

 

  • pont/o pons
  • radicul/o nerve root
  • thalam/o thalamus
  • thec/o sheath (refers to meninges)
  • vag/o vagus nerve

Combining Form Meaning

COMBINING FORMS
AND TERMINOLOGY

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SYMPTOMS

 

  • alges/o, -algesia
  • -algia
  • caus/o
  • comat/o
  • esthesi/o, -esthesia
  • kines/o, -kinesia

excessive sensitivity to pain

pain

burning

deep sleep

feeling, nervous sensation

movement

Combining Form Meaning

COMBINING FORMS
AND TERMINOLOGY

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SYMPTOMS

 

  • -kinesis, kinetic
  • -lepsy
  • lex/o
  • -paresis
  • -phasia

movement

seizure

word, phrase

slight paralysis

speech

Combining Form Meaning

COMBINING FORMS
AND TERMINOLOGY

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SYMPTOMS

 

  • -plegia
  • -praxia
  • -sthenia
  • syncop/o
  • tax/o

paralysis

action

strength

cut off

order, coordination

Combining Form Meaning

COMBINING FORMS
AND TERMINOLOGY

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QUICK QUIZ:

3. Which term means nerve pain?

 

A. cephalgia

B. analgesia

C. hypalgesia

D. neuralgia

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CORRECT Answer is D, neuralgia

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QUICK QUIZ:

4. Which type of hematoma occurs between the skull and the dura as a result of a ruptured meningeal artery, usually after a fracture of the skull?

 

A. subdural

B. epidural

C. intracerebral

 

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CORRECT Answer is C, epidural. See page 346, figure 10-11 for more information.

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Chapter 10
Lesson 10.3

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Pathologic Conditions

Congenital Disorders

  • Hydrocephalus
  • Spina bifida
  • Spina bifida cystica
  • Spina bifida occulta

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How is hydrocephalus treated?

What are the two types of spina bifida? Ask students to describe the differences between the two types.

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Degenerative, Movement, and Seizure Disorders

  • Alzheimer disease (AD)
  • Amyotrophic lateral sclerosis (ALS)
  • Epilepsy
  • Huntington disease
  • Multiple sclerosis (MS)
  • Myasthenia gravis (MG)
  • Palsy
  • Parkinson disease
  • Tourette syndrome

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Which conditions are movement related?

Which conditions are degenerative?

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Infectious Disorders

 

  • Herpes zoster (shingles)
  • Meningitis
  • Human immunodeficiency virus (HIV) encephalopathy

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What is a viral infection caused by chickenpox?

What types of meningitis exist, and how is meningitis treated?

What is the most malignant form of brain tumor?

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Traumatic Disorders

  • Cerebral concussion:
  • Temporary brain dysfunction after injury
  • Usually clears within 24 hours
  • Cerebral contusion:
  • Bruising of brain tissue through direct trauma to head
  • Neurological deficits persist longer than 24 hours

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What is the primary difference between a concussion and a contusion?

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Vascular Disorders

  • Thrombotic — blood clot in artery leading to the brain
  • Embolic — dislodged clot that travels to cerebral arteries
  • Hemorrhagic — a blood vessel, such as the cerebral artery breaks, and bleeding occurs

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What is the primary difference between a concussion and a contusion?

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Vascular Disorders

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There are three types of cerebrovascular accident (CVA): thrombotic, embolic, and hemorrhagic.

What is another name for CVA?

What causes a transient ischemic attack (TIA)?

 

 

 

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Clinical Procedures

X-ray Tests

  • Cerebral angiography
  • Computed tomography (CT) of the brain

Other Procedures

  • MRI and MRA -Magnetic resonance Imaging and magnetic resonance angiography
  • EEG-Electroencephalography
  • Lumbar Puncture

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Which x-ray uses a contrast medium?

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Abbreviations

Abbreviations

  • AD
  • AFP
  • ALS
  • AVM
  • CNS
  • CT
  • CSF
  • CVA

Alzheimer disease

alpha-fetoprotein

amyotrophic lateral sclerosis

arteriovenous malformation

central nervous system

computed tomography

cerebrospinal fluid

cerebrovascular accident

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Which items are disorders or injuries, and which are procedures?

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  • EEG
  • GABA
  • ICP

 

  • LP
  • MAC
  • MG
  • MRA
  • MRI

electroencephalogram

gamma-aminobutyric acid (neurotransmitter)

intracranial pressure; normal pressure is 5-15 mmHG

lumbar puncture

monitored anesthetic care

myasthenia gravis

magnetic resonance angiography

magnetic resonance imaging

Abbreviations

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Which items are pathologies, and which are tests?

What is an EEG used to measure?

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    • 1/2 P
    • PET
    • Sz
    • TBI
    • TENS

 

  • TIA
  • tPA
  • hemiparesis
  • positron emission tomography
  • seizure
  • traumatic brain injury
  • transcutaneous electrical nerve stimulation
  • transient ischemic attack
  • tissue plasminogen activator

Abbreviations

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Which of the items listed above are pathologies (describe them)?

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Practical Applications

  • What symptoms signal nervous system problems?
  • What tests are conducted to diagnose these problems?
  • Why are an MRI and an MRA ordered?
  • What are common pathologies of the nervous system?

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REVIEW SHEET

COMBINING FORMS

 

 

    • alges/o ___________
    • angi/o ___________
    • caus/o ___________
    • cephal/o ___________
    • cerebell/o ___________
    • cerebr/o ___________

 

Combining Form Meaning

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COMBINING FORMS

 

 

    • alges/o sensitivity to pain
    • angi/o vessel, blood
    • caus/o burn, burning
    • cephal/o head
    • cerebell/o cerebellum
    • cerebr/o cerebrum

 

Combining Form Meaning

REVIEW SHEET

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COMBINING FORMS

 

 

  • comat/o ___________
  • crani/o ___________
  • cry/o ___________
  • dur/o ___________
  • encephal/o ___________
  • esthesi/o ___________

Combining Form Meaning

REVIEW SHEET

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COMBINING FORMS

 

 

  • comat/o deep sleep
  • crani/o skull
  • cry/o cold
  • dur/o dura mater
  • encephal/o brain
  • esthesi/o nervous sensation

Combining Form Meaning

REVIEW SHEET

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COMBINING FORMS

 

 

  • gli/o _________
  • hydr/o _________
  • kines/o _________
  • lept/o _________
  • lex/o _________
  • mening/o, meningi/o _________
  • my/o _________

Combining Form Meaning

REVIEW SHEET

Copyright © 2008, 2005 by Saunders, an imprint of Elsevier Inc. All rights reserved.

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Copyright © 2008, 2005 by Saunders, an imprint of Elsevier Inc. All rights reserved.

COMBINING FORMS

 

 

  • gli/o glue
  • hydr/o water
  • kines/o movement
  • lept/o thin, slender
  • lex/o word, phrase
  • mening/o, meningi/o membranes, meninges
  • my/o muscle

Combining Form Meaning

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Copyright © 2008, 2005 by Saunders, an imprint of Elsevier Inc. All rights reserved.

COMBINING FORMS

 

 

  • myel/o ___________
  • narc/o ___________
  • neur/o ___________
  • olig/o ___________
  • pont/o ___________
  • radicul/o ___________

Combining Form Meaning

REVIEW SHEET

Copyright © 2008, 2005 by Saunders, an imprint of Elsevier Inc. All rights reserved.

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Copyright © 2008, 2005 by Saunders, an imprint of Elsevier Inc. All rights reserved.

COMBINING FORMS

 

 

  • myel/o spinal cord
  • narc/o sleep
  • neur/o nerve
  • olig/o scanty
  • pont/o pons
  • radicul/o nerve root

Combining Form Meaning

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Copyright © 2008, 2005 by Saunders, an imprint of Elsevier Inc. All rights reserved.

COMBINING FORMS

 

 

  • spin/o ___________
  • syncop/o ___________
  • tax/o ___________
  • thalam/o ___________
  • thec/o ___________
  • troph/o ___________
  • vag/o ___________

Combining Form Meaning

REVIEW SHEET

Copyright © 2008, 2005 by Saunders, an imprint of Elsevier Inc. All rights reserved.

*

 

Copyright © 2008, 2005 by Saunders, an imprint of Elsevier Inc. All rights reserved.

COMBINING FORMS

 

 

  • spin/o spine
  • syncop/o cut off
  • tax/o order
  • thalam/o thalamus
  • thec/o sheath (refers to meninges)
  • troph/o nourishment
  • vag/o vagus nerve

Combining Form Meaning

REVIEW SHEET

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What are external stimuli?

How can internal chemicals be stimuli?

What are some of the involuntary body functions controlled by the nervous system?

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Internal and external stimuli activate the cell membranes to release stored electrical energy called the nervous impulse.

External and internal receptors receive and transmit these impulses to the brain and spinal cord (central nervous system).

The central nervous system recognizes, interprets, and relays impulses to other nerve cells that extend through parts of the body such as muscles, glands, and organs.

What is the scope of influence nerve cells have on bodily function?

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Cranial nerves carry electrical impulses between the brain and the head and neck (except vagus nerve).

Spinal nerves carry impulses between the spinal cord and the chest, abdomen, and extremities.

Why is the 10th cranial nerve called the vagus nerve? What does it do?

 

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What is the difference between voluntary and involuntary functioning?

What are parasympathetic and sympathetic nerves?

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The autonomic nervous system contains a large group of nerves that function automatically.

It controls heart, blood vessels, glands, and involuntary muscles like intestines, and hollow organs such as stomach and urinary bladder.

Why is the autonomic nervous system necessary?

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How are stimuli processed by the nervous system?

What are the parenchymal cells of the nervous system?

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What structure carries the nerve impulse away from the cell body?

What substances are examples of neurotransmitters?

What is the singular form of “ganglia”?

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Answers are on the next slide.

What are the parts of the neurons shown in this slide?

What structures comprise the parenchymal cells of the nervous system?

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What are the parts of the neurons shown in this slide?

What structures comprise the parenchymal cells of the nervous system?

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How do the glia cells keep the nervous system healthy?

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These are the supportive, protective, and connective cells of the central nervous system.

(recap) What purpose does stromal tissue serve?

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The brain is divided into right and left hemispheres.

The brain consists of four major lobes, including the frontal lobe, parietal lobe, temporal lobe, and occipital lobe.

What are the parts of the left cerebral hemisphere as shown in the diagram?

What primary functions are carried out by the different lobes of the brain?

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What is the purpose of the cerebral cortex?

How many major divisions can be applied to the entire cerebral cortex?

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What is the value of the ability to sense pain?

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How do messages travel from one side of the brain to another?

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How does the word “crossover” apply to a function of the medulla oblongata?

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The spinal cord is the column of nervous tissue from the medulla oblongata to second lumbar vertebra.

It serves as a pathway for impulses to and from the brain.

The inner section of the cross-section of the spinal cord is gray matter.

The outer section of the cross-section of the spinal cord is white matter.

What is the difference between efferent and afferent neurons?

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Meninges are the three layers of connective tissue membranes that surround the brain and spinal cord.

What is the function of the outer dura mater? (channels blood to brain tissue)

What fluid lies between the arachnoid membrane and the subarachnoid space?

The inner pia mater offers a rich supply of blood vessels.

Where are the layers of the meninges in the figure?

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Meninges are the three layers of connective tissue membranes that surround the brain and spinal cord.

What is the function of the outer dura mater? (channels blood to brain tissue)

What fluid lies between the arachnoid membrane and the subarachnoid space?

The inner pia mater offers a rich supply of blood vessels.

Where are the layers of the meninges in the figure?

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Reference pages 260-262 for definitions of vocabulary terms

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Reference pages 260-262 for definitions of vocabulary terms

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Reference pages 260-262 for definitions of vocabulary terms

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Reference pages 260-262 for definitions of vocabulary terms

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Reference pages 260-262 for definitions of vocabulary terms

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Reference pages 260-262 for definitions of vocabulary terms

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Reference pages 260-262 for definitions of vocabulary terms

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Reference pages 260-262 for definitions of vocabulary terms

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CORRECT Answer is B, gyrus

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CORRECT Answer is A, pia mater

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CORRECT Answer is D, neuralgia

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CORRECT Answer is C, epidural. See page 346, figure 10-11 for more information.

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How is hydrocephalus treated?

What are the two types of spina bifida? Ask students to describe the differences between the two types.

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Which conditions are movement related?

Which conditions are degenerative?

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What is a viral infection caused by chickenpox?

What types of meningitis exist, and how is meningitis treated?

What is the most malignant form of brain tumor?

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What is the primary difference between a concussion and a contusion?

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What is the primary difference between a concussion and a contusion?

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There are three types of cerebrovascular accident (CVA): thrombotic, embolic, and hemorrhagic.

What is another name for CVA?

What causes a transient ischemic attack (TIA)?

 

 

 

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Which x-ray uses a contrast medium?

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Which items are disorders or injuries, and which are procedures?

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Which items are pathologies, and which are tests?

What is an EEG used to measure?

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Which of the items listed above are pathologies (describe them)?

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