Cranial nerves & what they do

Question 1

CN I: olfactory

Answer 1

SVA: special sense of smell

Question 2

CN II: optic

Answer 2

SVA: special sense of vision

Question 3

CN III: oculomotor

Answer 3

GSE: motor innervation to superior, medial, & inferior recti, inferior oblique, and levator palpebrae superioris
GVE: parasympathetic to sphincter pupillae (constrict pupil) & ciliary muscle (accomodation)

Question 4

CN IV: trochlear

Answer 4

GSE: motor innervation to superior oblique

Question 5

CN VI: Abducens

Answer 5

GSE: motor innervation to the lateral rectus

Question 6

CN V: trigeminal

Answer 6

SVE: motor innervation to muscles of mastication
GSA: sensory to face and scalp

Question 7

CN V1: ophthalmic division

Answer 7

sensation from cornea, skin of forehead & scalp, upper eyelid, part of nose and part of nasal cavity, paranasal sinuses

Question 8

CN V2: maxillary division

Answer 8

sensation form skin of face, lower eyelid, cheek, upper lip, maxillary teeth, mucosa of nose, maxillary sinus & palate

Question 9

CN V3: mandibular division

Answer 9

sensation from skin of mandible, lower lip, mandibular teeth, TM joint, mucosa of mouth and anterior 2/3 of tongue
& motor of muscle of mastication, mylohyoid, anterior belly of digastric, tensor veli palatini, and tensor tympani

Question 10

CN VII: facial

Answer 10

SVE: motor innervation to the muscles of facial expression, stapedius of middle ear, stylohyid, and posterior belly of digastric M
GVE: parasympathetic innervation to lacrimal, nasal, submandibular & sublingual glands
SVA: taste to anterior 2/3 of tongue via chorda tympani and palate
GSA: sensation to external acoustic meatus

Question 11

CN VIII: vestibulocochlear

Answer 11

SSA: special sense of hearing and equilibrium
vestibular sensation from semicircular ducts, utricle, and saccule related to position of head
hearing from spiral organ

Question 12

CN IX: glossopharyngeal

Answer 12

GSA: sensation from external ear and external auditory canal, and posterior 1/3 of tongue
GVA: sensory info from parotid gland, and carotid body (and sinus), pharynx, and middle ear
SVA: taste to posterior 1/3 of tongue
GVE: parasympathetics to parotid gland
SVE: motor to stylopharyngeus muscles–swallowing

Question 13

CN X: vagus

Answer 13

GSA: sensation from external auditory canal and dura mater from posterior cranial fossa
GVA: sensory info from viscera, pharynx, larynx, aortic arch, epiglottis, and base of tongue
SVA: taste from epiglottis and palate
GVE: para to viscera
SVE: motor to constrictors of pharynx, palatine muscles, and intrinsic muscle of larynx

Question 14

CN XI: spinal accessory

Answer 14

GSE: motor to sternocleidomastoid and trapezius

Question 15

CN XII: hypoglossal

Answer 15

GSE: motor to intrinsic tongue muscles and styloglossus, hyoglossus, and genioglossus