Cranial Nerves

Front 1

CN I

Back 1

Olfactory Nerve

Front 2

CN II

Back 2

Optic Nerve

Front 3

CN III

Back 3

Oculomotor Nerve: supplies medial rectus, superior rectus, inferior rectus, inferior oblique, levator palpebrae superior, papillary constrictor and levator palpebrae muscles

Front 4

CN IV

Back 4

Trochlear: innervates the superior oblique muscle (moves eye inferiorly and medially)

Front 5

CN V

Back 5

Trigeminal Nerve:

Front 6

CN VI

Back 6

Abducens Nerve: innervates the lateral rectus. very prone to compression

Front 7

CN VII

Back 7

Facial Nerve: afferent taste sensation from anterior 2/3 of tongue, proprioception from facial muscles and cutaneous sensation from part of ear and ear canal

Front 8

CN VIII

Back 8

Eustachian or acoustic nerve

Front 9

CN IX

Back 9

Glossopharyngeal: supplies constrictors of the pharynx, sensation from upper pharynx and taste from posterior 1/3 of tongue

Front 10

CN X

Back 10

Vagus nerve: autonomic innervation to the heart, lungs, esophagus and stomach

Front 11

CN XI

Back 11

Accessory Nerve: innervates sternocleiomastoid and trapezius muscles

Front 12

CN XII

Back 12

Hypoglossal: supplies genioglossus and tongue muscles

Front 13

lesion of CN 3

Back 13

unilateral ptosis progressing to inability to open the eye, lateral and slightly inferior deviation of the eye, pupil dilation, no direct reaction to light, preservation of the consensual papillary response

Front 14

lesion of CN 4

Back 14

diplopia corrected by inclination of the head forward and toward the side of the unaffected eye

Front 15

lesion of CN 5

Back 15

soft-tactile, thermal, and pain sensation in the face, loss of the corneal and sneezing reflexes and paralysis of the muscles of mastication