Nervous System 4 - Introduction to Cranial Nerves

Question 1

Identify the cranial nerves by name and number?

Answer 1

Question 2

Do cranial nerves belong to the CNS or PNS and which cranial nerves belong to the PNS.

Answer 2

Most cranial nerves belong to the PNS.

The olfactory (CN I) and optic (CN II) nerves are part of the CNS.

Question 3

Identify where the cranial nerves emerge from the brain?

Answer 3

Question 4

Identify where the cranial nerves emerge from the brain in the cadaveric image?

Answer 4

Question 5

Name the foramina in the skull that the cranial nerve traverse?

Answer 5

Question 6

Describe the basic functions of the cranial nerves?

CN I - CN III

Answer 6

CN I olfactory:
Smell (sensory)

CN II optic:
Vision (sensory)

CN III oculomotor:
Moves the eye (motor)

Question 7

Describe the basic functions of the cranial nerves?

CN IV - CN VI

Answer 7

CN IV trochlear:
One extrinsic eye muscle (motor)

CN V trigeminal (BOTH)
Face, sinuses, teeth (sensory)
Muscles of mastication (motor)

CN VI abducens = innervates one extrinsic eye muscle that abducts the eye (motor)

Question 8

Describe the basic functions of the cranial nerves?

CN VII - CN IX

Answer 8

CN VII facial (BOTH):
Taste (sensory)
Muscles of facial expression and glands of the face (motor)

CN VIII vestibulocochlear:
Vestibular = equilibrium/balance (sensory)
Cochlear = hearing (sensory)

CN IX glossopharyngeal (BOTH):
Taste, pharynx (sensory)
One muscle and one gland (motor)

Question 9

Describe the basic functions of the cranial nerves?

CN X - CN XII

Answer 9

CN X vagus (BOTH)
Pharynx, larynx, bronchial tree, lungs, heart, GIT (sensory)
Pharynx, larynx, palate, trachea, bronchial tree, heart, GIT (motor)

CN XI accessory:
sternocleidomastoid and trapezius muscles (motor)

CN XII hypoglossal:
Tongue (motor)

Question 10

What is the mnemonic for learning the generic functions (sensory, motor or both) of the cranial nerves?

Answer 10

Question 11

Identify the cranial nerves on the image?

Answer 11