L20: Non-Parasympathetic Nerves (1-4,8,11,12)

Question 1

SSS

Answer 1

special somatic sensory

special senses derived from ectoderm
sight, sound, balance

Question 2

SVS

Answer 2

special visceral sensory

senses derived from endoderm
taste

Question 3

SVM

Answer 3

special visceral motor

muscles derived from pharyngeal arches

Question 4

GVS

Answer 4

general visceral sensory

general sensation from viscera

Question 5

GVM

Answer 5

general visceral motor

to smooth muscles of gut tract

autonomic motor

Question 6

GSS

Answer 6

general somatic sensory

general senses from ectoderm/skin

Question 7

GSM

Answer 7

general somatic motor

skeletal muscles

Question 8

cell bodies of sensory fibers are located in ?

Answer 8

dorsal root cranial ganglia

Question 9

CN I

Answer 9

olfactory nerve - SVS

made up of many fibers that pass from upper 1/3 of nasal mucosa

olfactory receptor cells thru cribiform plate to olfactory bulbs

Question 10

olfactory cells

Answer 10

bipolar neurons

posses cilia w/ G protein linked odor receptors

unmyelinated axon extending to olfactory bulb

Question 11

olfactory glands of bowman

Answer 11

located in lamina propria

secrete odorant binding protein

Question 12

olfactory bulbs

Answer 12

expanded endings of olfactory tracts

axons synapse w/ mitral cells

mitral cells connect to olfactory centers w/in brain

Question 13

CN II

Answer 13

optic nerve - SSS

begins in ganglionic layer of retina
exits via optic canal
50% decussation in optic chiasma

Question 14

CN III

Answer 14

oculomotor nerve

supplies extrinsic eye muscles

has a parasym component too

Question 15

CN IV

Answer 15

trochlear n - GSM

innervates sup oblique eye muscle
–eye mvt

only crossed cranial n
only cranial n that emerges dorsally

Question 16

CN VI

Answer 16

abducens n - GSM

abducens nucleus to lateral rectus muscles of the eye
–eye mvt

Question 17

CN VIII

Answer 17

vestibulocochlear n - SSS

auditory component

• -cell bodies in spiral ganglia of cochlea
• -hearing

vestibular component

• -cell bodies in vestibular ganglion
• -balance and equilibrium

Question 18

CN XI

Answer 18

spinal accessory n - SVM

considered part of vagus n

exits cranial cavity via jugular foramen

motor innervation to sternocleidomastoid and trapezius muscle

Question 19

CN XI - cranial roots

Answer 19

originate from nucleus ambiguous in medulla

join fibers of vagus n

Question 20

CN XII

Answer 20

hypoglossal n - GSM

from hypoglossal nucleus
exits cranium via hypoglossal foramen

in neck gives rise to:
ansa cervicalis
n to thyrohyoid muscle

supplies extrin/intrinsic muscles of tongue

Question 21

gives the names of the cranial nerves:
I
II
III
IV
VI
VIII
XI
XII

Answer 21

1. olfactory n
2. optic n
3. oculomotor n
4. trochlear
5. abducens
6. vestibulocochlear n
7. spinal accessory n
8. hypoglossal n