BIO 201 Lab #12: Cranial Nerves ONLY

Question 1

How many pairs of cranial nerves are there?

Answer 1

12

Question 2

Most cranial nerves innervate structures of the…

Answer 2

head and neck

Question 3

How many sensory, mixed, and motor nerves are there?

Answer 3

There are 3 sensory nerves, 4 mixed nerves, and 5 motor nerves

Question 4

What is the cranial nerve name mnemonic?

Answer 4

Oh Once One Takes Their Anatomy Final Very Good Vacations Are Heavenly

Oh = Olfactory
Once = Optic
One = Oculomotor
Takes = Trochlear
Their = Trigeminal
Anatomy = Abducens 
Final = Facial
Very = Vestibulocochlear
Good = Glossopharangeal 
Vacations = Vagus
Are = Accessory 
Heavenly = Hypoglossal

Question 5

CN I

Answer 5

Olfactory Nerve, sensory

Question 6

CN II

Answer 6

Optic Nerve, sensory

Question 7

CN III

Answer 7

Oculomotor Nerve, motor

Question 8

CN IV

Answer 8

Trochlear Nerve, motor

Question 9

CN V

Answer 9

Trigeminal Nerve, both

Question 10

CN VI

Answer 10

Abducens Nerve, motor

Question 11

CN VII

Answer 11

Facial nerve, both

Question 12

CN VIII

Answer 12

Vestibulocochlear Nerve, sensory

Question 13

CN IX

Answer 13

Glossopharyngeal Nerve, both

Question 14

CN X

Answer 14

Vagus Nerve, both

Question 15

CN XI

Answer 15

Accessory Nerve, motor

Question 16

CN XII

Answer 16

Hypoglossal Nerve, motor

Question 17

Type of nerve mnemonic

Answer 17

Some Say Marry Money But My Brother Says Big Brains Matter More

Some = Sensory
Say = Sensory
Marry = Motor
Money = Motor
But = Both 
My = Motor 
Brother = Both
Says = Sensory
Big = Both
Brains = Both 
Matter = Motor 
More = Motor

Question 18

CN I Olfactory Nerve function

Answer 18

sensory nerve, provides for the sense of smell

Question 19

CN II Optic Nerve function

Answer 19

sensory nerve, provides for sense of vision

Question 20

CN IV Trochlear Nerve function

Answer 20

motor nerve, innervates 1/6 extrinsic eye muscle

superior oblique

Question 21

CN V Trigeminal Nerve function

Answer 21

both sensory and motor, provides sensory innervation for face and motor innervation to muscles of mastication (chewing)

Question 22

CN VI Abducens Nerve function

Answer 22

motor nerve, innervates final extrinsic eye muscle

lateral rectus muscle

Question 23

CN VII Facial Nerve function

Answer 23

mixed nerve, innervates motor to the muscles of facial expression, taste to the tongue, motor to the lacrimal glands (produce tears) and sensory to part of the face and mouth

Question 24

CN VIII Vastibulocochlear Nerve function

Answer 24

sensory nerve, innervates structures of the inner ear and provides for the senses of hearing and equilibrium

Question 25

CN IX Glossopharyngeal nerve

Answer 25

mixed nerve, provides motor axons to pharynx and sensory axons to the tongue for taste sensation

Question 26

CN X Vagus Nerve

Answer 26

mixed nerve, only cranial nerve that “wanders” outside the head and neck

sensory innervation to skin of the head and pharynx, motor axons to the muscles involved in speech, swallowing, and salivary glands. Outside the head it innervates most of the thoracic and abdominal viscera (main nerve of the parasympathetic nervous system)

Question 27

CN XI Accessory Nerve

Answer 27

motor nerve, only cranial nerve that has a cranial component from the brainstem and a spinal component from the spinal cord.
Motor axons innervate the muscles that move the head and the neck (ex. trapezius and sternocleidomastoid muscle)

Question 28

CN XII Hypoglossal Nerve

Answer 28

mixed nerve, innervates the muscles that move the tongue

** The Hypoglossal nerve moves the tongue but does not provide any taste sensation