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Flashcards in Intro to Cranial Nerves Deck (77)
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1

general afferent fibers

sensory
have cell bodies in either dorsal root ganglia or nuclei/ganglia of specific cranial nerves

2

GSA

general somatic afferent

exteroreceptive impulses - pain temp touch
-from epithelium of ectodermal origin

proprioceptive impulses - tendons, joints

3

epithelium of ectodermal origin

all skin
ling of external ear
tympanic membrane
conjuctiva covering palebral surface of eye
lining of external nares
nasal cavity
paranasal sinuses
lining of mouth
anterior 2/3 of tongue
dura mater

4

GVA

general visceral afferent

sensory impulses - pain
-from visceral structures of endoderm origin

5

visceral structures of endoderm origin

posterior third of tongue
ducts of parotid gland
carotid sinus
pharynx
pharyngotympanic tube and middle ear
bronchial tree
larynx
esophagus
gut
pancreaticohepatic duct
lining of genitourinary tract

6

tongue innervation

anterior 2/3 GSA
posterior 1/3 GVA

7

blood vessel innervation

mesoderm derivative

still supplied by visceral afferents

8

special afferent fibers

only in cranial nerves

9

SSA

special somatic afferent

vision, hearing, equilibrium

ear and eye

10

SVA

special visceral afferent

olfactory and gustation

named visceral - because of functional association with the GI tract

11

general efferent fibers

motor fibers to muscles of body

except branchiomeric muscles

12

branchiomeric muscles

develop from pharyngeal arches

not somites

innervation is SVE

muscles of mastication, facial expression, pharynx, palate, larynx

13

GSE

general somatic efferent

motor impulses to somatic skeletal muscle

14

GVE

general visceral efferent

autonomics to smooth muscle in gut tube, blood vessels, cardiac muscle, glandular secretion

subdivided - S and PS and found in spinal and some cranial nerves

15

special efferent fibers

cranial nerves
innervate specialized area of skeletal muscle

16

SVE

special visceral efferent

skeletal muscles derived from pharyngeal arch mesoderm

NO autonomics

17

SSE

special somatic efferent

reflexively influence sensory input to ear

18

CN I

olfactory nerve
SVA

19

olfactory nerve

CN I SVA
sense of smell

20

destination of CN I

to olfactory striae
lateral - piriform cortex in anterior temoral lobe
medial - through anterior commisure to contralateral olfactory structures

21

CN II

optic nerve
SSA

22

optic nerve

CN II SSA
afferent fibers of retina - sense of sight

23

destination of CN II

medial fibers decussate and join lateral fibers of opposite side

terminate at lateral geniculate bodies of thalamus
-hen to occipital lobe

24

CN III

oculomotor nerve
GSE, GVE-P

25

oculomotor nerve GSE component

motor to extra-ocular muscles of eye
-rotational movement
-4 of 6 - superior, medial, inferior recti, inferior oblique AND superior eyelid

26

oculomotor nerve GVE-P component

parasympathetic to intra-ocular muscles
-change shape of lense for accomodation
-narrowing pupil

via inferior division of CN III (ciliary ganglion)

27

inferior division of CN III

oculomotor nerve GVE-P component

ciliary ganglion

28

CN IV

trochlear nerve
GSE

29

trochlear nerve

CN IV GSE
innervation of one of extraocular eye muscle
-superior oblique (utilizes pulley)

30

innervation of extraocular muscles of eye

CN III - superior, medial, inferior recti, inferior oblique
CN IV - superior oblique
CN VI - lateral rectus