cranial nerves Flashcards
olfactory nerve is a special somatic
false
it is a special visceral
what does the optic nerve innervate and its function
the retina of the eye
vision and pupile reflection and accomodation reflexion
from where the optic nerve exit
optic canal
from where the olfactory nerve exit
cribriform canal
describe the pathway of optic nerve
photoreceptor, optic disc, optic nerve, cross to the opposit site (optic chiasm)
what does the olfactory nerve inervate
nasal cavity
what does the olfactory nerve innervate
nasal cavity
what is the number of oculomotor nerve
3
what does the 3rd cranial nerve do
a motor nerve that innervates the muscles of the eye:
superior rectus
medial rectus
inferior rectus
inferior oblique (up and in)
levator palpebrae (Elevates the upper eyelid)
Iris sphincter muscle (constriction of pupile)
oculomotor nerve exit from
superior orbital fissur
what is the 4th nerve
trochlear nerve
what does the trochlear do
innervates the superior oblique muscle
from where the 4th nerve exit
superior orbital fissure
what is the 5th nerve and what is its type?
trigeminal nerve, it is a mixt nerve composed of 3 parts
name the parts of 5th nerve and from where they exit
ophthalmic (superior orbital fissure)
maxillary (foramen rotundun)
mandibular (foramen oval)
what are the functions of mandibular nerve
sensory: lower 2/3 of the face, genarel sensation of 2/3 anterior tongue, lower lip, the lower row of teeth.
motor: muscles of mastication, swallowing
what are the functions of ophthalmic nerve
sensory:
scalp, forehead, upper eyelid, cornea, nose
what are the functions of maxillary nerve
sensory:
lower eyelid, checks, maxillary sinus, upper lip and upper teeth row, superior palate.
what number is abducens nerve and what does it do
number 6
innervate the lateral rectus muscle of the eye
what is the 7th cranial nerve, and what is its type ?
facial nerve
mixt
what does the motor part of facial nerve do?
innervate the muscles of : facial expression, digastric muscle, stylohyoid, stapedius
what does the sensory part of facial nerve do?
special sensation: 2/3 of anterior thongue
general sensation: concha of external ear
parasympathetic: sublingual and submandibular glands
from where does the 7th nerve exit
internal acoustic meatus
what id the name of 8th cranial nerve and what is its type
vestibulocochlear
sensory
what are the parts of vestibulocochlear nerve
vestibular: balance
cochlear: hearing
what is the 9th cranial nerve and its type
glossopharyngeal
mixt
