Lab Practical 5

Question 1

The 12 pairs of cranial nerves are part of what system? PNS or CNS?

Answer 1

PNS - peripheral nervous system

Question 2

The 12 cranial nerves are divided into what two categories?

Answer 2

sensory and motor

Question 3

I Olfactory

Answer 3

sensory for smell

Question 4

II Optic

Answer 4

sensory for vision from retina

Question 5

III Oculomotor

Answer 5

motor for 4 eye muscles, eyelid,lens & pupil

Question 6

IV Trochlear

Answer 6

motor for superior oblique eye muscle (move eye inward and up)

Question 7

V Trigeminal

Answer 7

sensory for touch on face
motor for mastication

Question 8

VI Abducens

Answer 8

motor for lateral rectus eye muscle (move eye outward)

Question 9

VII Facial

Answer 9

sensory for taste on anterior tongue & touch on external ear, palate, nasal cavity
motor for facial expression & PSNS to salivary glands, lacrimal glands (tears)

Question 10

VIII Vestibulocochlear

Answer 10

sensory for body position from vestibule & hearing from cochlea

Question 11

IX Glossopharyngeal

Answer 11

sensory for taste on posterior tongue, pharynx touch & vessel BP;
motor for swallowing & gag reflex

Question 12

X Vagus

Answer 12

sensory for touch/taste on pharynx,
motor for larynx, pharynx

Question 13

XI Accessory

Answer 13

motor for head, neck and shoulder muscles

Question 14

XII Hypoglossal

Answer 14

motor for intrinsic & extrinsic tongue muscles