cn

Question 1

olfactory n. (CN 1)

origin
fiber type
function
exits through

Answer 1

forebrain
special sensory + motor
smell
cribriform plate of ethmoid bone

Question 2

optic n. (CN 2)

origin
fiber type
function
exits through

Answer 2

forebrain
special sensory
vision
optic canal

Question 3

oculomotor n. (CN 3)

origin
fiber type
(functions on different card)
exits through

Answer 3

midbrain
somatic efferent + visceral efferent
superior orbital fissure

Question 4

visceral efferent (motor) fibers of CN 3 (oculomotor n.) innervate what?

Answer 4

parasympathetic innervation to sphincter pupillae m. and ciliary mm. that constrict pupil + accommodate lens

Question 5

somatic efferent (motor) fibers of CN 3 (oculomotor n.) innervate what?

Answer 5

motor innervation to:
superior / inferior / medial rectus mm.
inferior oblique m.
levator palpebrae superioris m.

Question 6

trochlear n. (CN 4)

origin
fiber type
function
exits through

Answer 6

midbrain
somatic efferent
motor innervation to superior oblique m.
superior orbital fissure

Question 7

ophthalmic branch of trigeminal n. (V1)

origin
fiber type
function
exits through

Answer 7

pons
somatic afferent
sensation from cornea, skin of forehead, scalp, eyelids, nose, nasal cavity +paranasal sinus mucosa
superior orbital fissure

Question 8

maxillary branch of trigeminal n. (V2)

origin
fiber type
function
exits through

Answer 8

pons
somatic afferent
sensation from skin of face over maxilla, upper lip, maxillary teeth, mucosa of nose, maxillary sinuses, palate
foramen rotundum

Question 9

SENSORY mandibular branch of trigeminal n. (V3)

origin
fiber type
function
exits through

Answer 9

pons
somatic afferent
sensation from skin over mandible, lower lip, mandibular teeth, TMJ, mucosa of mouth, anterior 2/3rds of tongue
foramen ovale

Question 10

MOTOR mandibular branch of trigeminal n. (V3)

origin
fiber type
function
exits through

Answer 10

pons
visceral efferent
motor to mm. of mastication, mylohyoid m., anterior belly of digastric m., tensor veli palatini m., tensor tympani m.
foramen ovale

Question 11

abducens n. (CN 6)

origin
fiber type
function
exits through

Answer 11

pons
somatic efferent
motor to lateral rectus m.
superior orbital fissure

Question 12

special sensory of facial n. (CN 7)

nucleus origin
function
exits through

Answer 12

solitary tract nucleus (pons)
taste from anterior 2/3rd of tongue
internal auditory meatus

Question 13

visceral efferent of facial n. (CN 7)

fiber type
nucleus origin
function
exits through

Answer 13

parasympathetics!
superior salivatory nucleus
innervation of submandibular + sublingual + lacrimal glands
internal auditory meatus

Question 14

somatic efferent of facial n. (CN 7)

fiber type
function
exits through

Answer 14

motor
innervates mm. of facial expression + stapedius m., stylohyoid m., posterior belly of digastric m.
internal auditory meatus

Question 15

somatic afferent of facial n. (CN 7)

function
exits through

Answer 15

sensation of external ear, ear canal, TM (along with auricular branch of vagus n. (CN 10), greater auricular n., lesser occipital n., auriculotemporal n.)
internal auditory meatus

Question 16

vestibulocochlear n. (CN 8)

fiber type
function
exits through

Answer 16

special sensory
vestibular- sensation from semicircular canals, utricle, saccule for proprioception
cochlear- hearing from the cochlea
internal auditory meatus

Question 17

special sensory for glossopharyngeal n. (CN 9)

nucleus origin
function
exits through

Answer 17

spinal nucleus of trigeminal n. / solitary tract nucleus
taste from posterior 1/3rd of tongue
jugular foramen

Question 18

visceral efferent for glossopharyngeal n. (CN 9)

fiber type
nucleus origin
function
exits through

Answer 18

parasympathetics!
inferior salivatory nucleus
innervation of parotid + buccal + labial gland
jugular foramen

Question 19

somatic efferent for glossopharyngeal n. (CN 9)

nucleus origin
function
exits through

Answer 19

nucleus ambiguus
motor- stylopharyngeus m.
jugular foramen

Question 20

visceral afferent for glossopharyngeal n. (CN 9)

nucleus origin
function
exits through

Answer 20

spinal nucleus of trigeminal n. / solitary tract nucleus
receives sensory input from chemoreceptors in carotid body + baroreceptors in carotid sinus
jugular foramen

Question 21

somatic afferent for glossopharyngeal n. (CN 9)

nucleus origin
function
exits through

Answer 21

spinal nucleus of trigeminal n. / solitary tract nucleus
sensory input from posterior 1/3rd of tongue, soft palate, pharyngeal mucosa, tonsils, tympanic cavity, internal surface of TM, external ear, EAC (blends with vagus n. (CN 10))
jugular foramen

Question 22

special sensory for vagus n. (CN 10)

function
exits through

Answer 22

taste from epiglottis
jugular foramen

Question 23

somatic efferent for vagus n. (CN 10)

nucleus origin
function
exits through

Answer 23

nucleus ambiguus
motor to pharyngeal + laryngeal mm.
jugular foramen

Question 24

visceral efferent for vagus n. (CN 10)

fiber type
nucleus origin
function
exits through

Answer 24

parasympathetics!
posterior nucleus of vagus
innervation of thoracic + abdominal viscera
jugular foramen

Question 25

visceral afferent for vagus n. (CN 10)

nucleus origin
function
exits through

Answer 25

solitary tract nucleus
sensation from lower pharynx at esophageal jxn, laryngeal mucosa above + below vocal fold, baroreceptors in aortic arch, chemoreceptors in para-aortic body, thoracic + abdominal viscera
jugular foramen

Question 26

somatic afferent for vagus n. (CN 10)

function
exits through

Answer 26

sensation from dura in posterior cranial fossa, skin of ear, EAC
jugular foramen

Question 27

accessory n. (CN 11)

nucleus origin
fiber type
function
enters through
exits through

Answer 27

nucleus ambiguus
somatic efferent
innervates SCM m., trapezius m.
enters via foramen magnum
exits via jugular foramen

Question 28

hypoglossal n. (CN 12)

fiber type
function
exits through

Answer 28

somatic efferent
innervates tongue mm. (except palatoglossus m.)
hypoglossal canal