Cranial nerves

Question 1

I - name, origin, exit, function

Answer 1

olfactory 
cerebrum 
cribiform plate
special visceral sensory - senses derived from endoderm
smell

Question 2

II - name, origin, exit, function

Answer 2

optic
cerebrum
optic canal 
special somatic sensory - senses derived from ectoderm
vision

Question 3

III - name, origin, exit, function

Answer 3

oculomotor
midbrain-pontine junction
superior orbital fissure
general somatic motor - 4 extrinsic eye muscles and palpebrae superioris
general visceral motor - pupillary sphincter

Question 4

IV - name, origin, exit, function

Answer 4

trochlear
posterior side of midbrain
superior orbital fissure
general somatic motor (skeletal muscles) - superior oblique

Question 5

V - types

Answer 5

trigeminal: opthalamic, maxillary, mandibular

Question 6

V- origin

Answer 6

pons

Question 7

Opthalamic trigeminal nerve: exit, function

Answer 7

superior orbital fissure

general somatic sensory - skin (scalp, forehead, nose)

Question 8

Maxillary trigeminal nerve: exit, function

Answer 8

f. rotundum

general somatic sensory - cheeks, lower eye lid, nasal mucosa, upper lip, upper teeth and palate

Question 9

mandibular trigeminal nerve: exit, function

Answer 9

F. ovale
general somatic sensory: anterior 2/3 tongue, skin over mandible and lower teeth
special visceral motor - derived from pharyngeal arches (muscles of mastication).

Question 10

VI - name, origin, exit, function

Answer 10

abducens
pontine medullary junction
superior orbital fissure
general somatic motor (skeletal muscles) - lateral rectus

Question 11

VII - name, origin, exit, function

Answer 11

facial
pontine-medullary junction
internal acoustic meatus > stylomastoid f
GSS: sensation to part of ext. ear.
SVS: taste from ant. 2/3 tongue, hard and soft palate.
GSM: muscles of facial expression.
GVM: lacrimal, submandibular, sublingual glands and mucous glands of mouth and nose

Question 12

VIII - name, origin, exit, function

Answer 12

vestibulocochlear
pontine-medullary junction
internal acoutstic meatus
special somatic sensory (ectoderm) - hearing and balance

Question 13

IX - name, origin, exit, function

Answer 13

glossopharyngeal 
posterior to olive in medulla oblongata
jugular f. 
GSS: post. 1/3 tongue, ext. ear, and middle ear cavity.
GVS: carotid body and sinus.
SVS: taste from post. 1/3 tongue.
GVM: parotic gland. SVM: stylopharyngeus

Question 14

X - name, origin, exit, function

Answer 14

vagus
posterior to olive in medulla oblongata
jugular f.
GSS: ext. ear, larynx and pharynx.
GVS: larynx, pharynx and, thoracic & abdominal viscera.
SVS: taste from epiglottis region of tongue
GVM: smooth muscles of pharynx, larynx and most of the GIT.
SVM: most muscles of pharynx and larynx.

Question 15

XI - name, origin, exit, function

Answer 15

spinal accessory
posterior to olive in medulla oblongata
jugular f. 
GSM: trapezius and sternocleidomastoid.
SVM: a few fibres run with X to viscera.
(motor)

Question 16

XII- name, origin, exit, function

Answer 16

hypoglossal
anterior to olive in medulla oblongata
hypoglossal canal 
motor - GSM
instrinsic and extrinsic tounge muscles (except palatoglossus)

Question 17

GSS

Answer 17

general somatic sensory - general sensation from the skin

Question 18

GVS

Answer 18

general visceral sensory - general sensation from the viscera

Question 19

SSS

Answer 19

special somatic sensory - senses derived from ectoderm (sight, sound, balance)

Question 20

SVS

Answer 20

special visceral sensory - senses derived from endoderm (taste, smell)

Question 21

GSM

Answer 21

general somatic motor - skeletal muscles

Question 22

GVM

Answer 22

general visceral motor - smooth muscles of gut and autonomic motor

Question 23

SVM

Answer 23

special visceral motor - muscles derived from pharyngeal arches