4. CN - Intro and Fx

Question 1

how are CNs numbered?

Answer 1

by the way they exit the brain

Question 2

CN I

Answer 2

Olfactory; smell

Question 3

CN II

Answer 3

Vision; biggest CN, nerve crossing at chiasma

Question 4

CN III

Answer 4

Oculomotor; move eyeball and pupil

Question 5

CN IV

Answer 5

Trochlear; only nerve to exit brainstem dorsally, motor to 1 extraocular muscle

Question 6

CN V

Answer 6

Trigeminal; face sensation, motor to muscles of mastication (V3)

Question 7

CN VI

Answer 7

Abducens; eye movement, motor to 1 extraocular eye muscle, abducts pupiil

Question 8

CN VII

Answer 8

Facial; muscles of expression, taste, salivation, tears, nasal mucosa secretion (PARASYMP)

Question 9

CN VIII

Answer 9

Vestibulocochlear; hearing and balance

Question 10

CN IX

Answer 10

Glossopharyngeal; pharynx sensation, parotid salivation, innervates back of tongue (PARASYMP)

Question 11

CN X

Answer 11

Vagus; motor to pharynx, larynx, palate, visceral smooth muscle of GI tract; visceral sensation (PARASYMP)

Question 12

CN XI

Answer 12

Spinal Accessory; motor to neck muscles - leaves SC, goes up foramen magnum then down to trapezius and sternocleidomastoid

Question 13

CN XII

Answer 13

Hypoglossal; motor to tongue muscles, in line with cervical spinal roots