Chapter 34 Part 1- Flashcards Preview

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1

2 categories of Nervous system

CNS (central)- brain and spinal cord.
PNS (peripheral) remaining nerves of brain and spinal cord

2

CNS (central)

Reflex arc - short cut in reflex system between the spinal cord and sensory nerve.

3

PNS (peripheral)

3 components:
-spinal nerves
-cranial nerves
-autonomic nervous system

4

Spinal nerves

From spinal cord to periphery
Motor and sensory

5

Pairs of spinal nerves

31:
Cervical- (neck)-8
Thoracic- (cheat) 12
Lumbar- (lower back) 5
Sacral- (hip) 5
Coccygeal (tail bone) 1

6

Where do spinal nerves exit

Spinal canal of vertebrae via intervertebral foramen.

7

Never end within the spinal cord do not

Regenerate and damage is usually permanent.

8

Pairs of cranial nerves

12.
Olfactory
Optic
Oculomotor
Trochlear
Trigeminal
Abducens
Facial
Statoacoustic (acoustic)
Glossopharyngeal
Vagus
Accessory
Hypoglossal

9

Olfactory nerve

Sense of smell

10

Optic nerve

Vision

11

Oculomotor

Supplies the muscles that move the eyes

12

Trochlear

Supplies muscle that moves eye downward/laterally

13

Trigeminal

Supplies teeth, oral cavity, max. Sinus, nasal cavity, and skin to face

14

Abducens

Supplies muscle that moves eye laterally

15

Facial

Muscles of facial expression

16

Statoacoustic

Hearing and balance (equilibrium)

17

Glossopharyngeal

Motor to stylopharyngeous
Sensory to posterior 1/3 of tongue
General sensations- pain, pressure, heat and cold

18

Vagus

Motor to larynx/pharynx
Taste and general sensations from root of tongue/epiglottis

19

Accessory (spinal accessory)

Supplies trapezius and SCM

20

Hypoglossal

Intrinsic/extrinsic muscles of the tongue

21

Visceral sensation

Sensation from viscera (organs) of the body

22

AND (autonomic)

2 parts:
-Sympathetic nervous system “fight or flight”
-parasympathetic “craniosacral outflow”

23

Antagonist

Have opposite actions

24

Sympathetic causes release of

Adrenaline

25

Autonomic is a 2 neuron system

Preganglionic neuron
Postganglionic neuron

26

Ganglion

Accumulation of cell bodies outside the CNS

27

Oral cavity nerves

Trigeminal (V)
Facial (VII)
Glossopharyngeal (IX)
Vagus (X)

28

Branches of trigeminal

3:
V1- opthalmic
V2- maximally
V3- mandibular

29

V1

3 branches:
Frontal
Lacrimal
Nasociliary

30

Where does V1 leave skull

Via supraorbital fissure

31

Frontal branch of V1

Via supraorbital notch
-Supraorbital nerve-skin above the eye and forehead. (Via supraorbital notch)
-Supra trochlear nerve- skin of upper medial corner of eye

32

Lacrimal branch of V1

Lacrimal gland

33

Nasociliary branch of V1

2 ethmoid branches to nasal cavity.
Infraochlear- medial corner of eye