Lab 5 Cranial Nerves

Question 1

• CN I

Answer 1

o Olfactory, sensory, smell

o Olfactory epithelium (telencephalon) through cribform plate. Ipsi. Terminates amygdala, perihippocampal gyrus

Question 2

CN II

Answer 2

o Optic, sensory, vision
o Retinal ganglion cells (diencephalon) optic nerve, chiasm, tract. Bilateral. Primary visual cortex, cervical sc, oculomotor n.

Question 3

CN III

Answer 3

o	Oculomotor, motor=eye movement (upper lid), reflex= pupillary constriction
o	Oculomotor (midbrain), interpeduncular fossa, sinus, orb fissure. Ipsi. MR, SR, IR.
o	Edinger-westphal (midbrain), interpeduncular fossa etc. Ipsi. Ciliary ganglion, pupillae (constrictor)

Question 4

CN IV

Answer 4

o Trochlear, eye movement
o Trochlear n (midbrain), quadrigeminal cistern, ambient cistern, cavernous sinus, orb fissure. CONTRA. Superior oblique muscle

Question 5

CN V

Answer 5

o Trigeminal, jaw jerk reflex, tactile discrimination, thermal face, mastication
o Mesencephalic n. (midbrain) Mesencephalic tract of V. Bilateral. Motor n V.
o Trigeminal gang. (pons), trigeminal nerve branches, IPSI, sensory n. V.
o Trigeminal gang. (pons-cord). All branches trigeminal, spinal trigeminal tract. Ipsi. Spinal trigeminal n. of V.
o Motor n. Pons, V3 (mandibular branch) Ipsi. Mastication muscles.

Question 6

CN VI

Answer 6

o Abducens, Eye movement

o Abducens n. Pons, Exit PM ascend dorello’s canal sinus orb fissure. Ipsi, lateral rectus.

Question 7

CN VII

Answer 7

o Facial, taste (ant. 2/3), facial expression, salivation
o Geniculate gang. Through IAC temp bone stylomastoid, ipsi, n. solitarius
o N VII (pons), through IAC temp bone stylomastoid. IPSI, facial muscles
o Salivatory n. pons, IAC temp bone stylomastoid. Ipsi, parasympathetic gang.

Question 8

CN VIII

Answer 8

o	Vestibulocochlear, balance, hearing
o	Vestibular (scarpa). CNVIII IAC. Ipsi. Vestibular n levels 5-12
o	Cochlear (spiral). CN VIII IAC. Ipsi. Cochlear n. 8/9 rostral medulla

Question 9

CN IX

Answer 9

o Glossopharyngeal, taste post 1/3, swallowing, salivation
o Glossopharyngeal, CNIX jugular foramen, ipsi, solitarius pons 6/7 to sensory decussation
o Ambiguous 8/9, CNIX jugular, ipsi, stylopharyngeal muscle
o Salivatory n. VII, CNIX jugular, ipsi, pysum to parotid gland

Question 10

CN X

Answer 10

o Vagal, taste and visceral sensation, phonation, gland reg. parasympathetic
o Afferent g of X. Jugular, ipsi, n. solitarious pons 6/7 to sensory decussation
o Ambiguous 10/12, jugular, ipsi, muscles throat
o Dorsal efferent n. jugular, ipsi, esophagus, digestive organs, heart, viscera

Question 11

CN XI

Answer 11

o Accessory, phonation, head shoulder movement,

o Cervical ventral horn, jugular, ipsi, trapezius sternocleidomastoid muscles

Question 12

CN XII

Answer 12

o Hypoglossal, tongue movement

o Hypoglossal n. 10/12, hypoglossal canal, ipsi, tongue muscles.