Cranial Nerves Functions

Question 1

I/Olfactory

Answer 1

special sense of olfaction (small)

Question 2

II/Optic

Answer 2

special sense of vision

Question 3

III/Oculomotor

Answer 3

motor to certain extrinsic eyeball muscles, parasympathetic to pupil constrictor muscle

Question 4

IV/Trochlear

Answer 4

motor to dorsal oblique muscle of the eyeball

Question 5

V/Trigeminal, Mandibular

Answer 5

motor to muscles of mastication, sensory to lower jaw region

Question 6

V/Trangeminal, Maxillary

Answer 6

sensory to upper jaw

Question 7

V/Trangeminal, Opthalmic

Answer 7

sensory to frontal and eye region

Question 8

VI/Abducent

Answer 8

motor to lateral rectus and retractor bulbi muscles of the eyeball

Question 9

VII/Facial

Answer 9

motor to muscles of facial expression, sensory to external ear, special sense of gustation (taste) to rostral 2/3 of tounge

Question 10

VIII/Vestibulocochlear

Answer 10

special sense of balance (vestibulation); special sense of hearing

Question 11

IX/Glossopharyngeal

Answer 11

sensory to caudal 1/3 of tongue, special sense of taste to caudal 1/3 of tongue, motor to certain pharyngeal muscles, sensory to pharynx

Question 12

X/Vagus

Answer 12

motor to certain muscles of pharynx, motor to laryngeal muscles, sensory to pharynx and larynx, parasypathetic to smooth muscle of gut tube (esophagus, stomach, intestines) and lungs and to heart muscles

Question 13

XI/Spinal Accessory

Answer 13

small contribution to pharyngeal plexus, motor to certain neck muscles (ventral branch to ventral strap muscle and dorsal branch to trapezius)

Question 14

XII/Hypoglassal

Answer 14

motor to tongue muscles