Lab 4a- Brainstem and Spinal Cord

Question 1

What are motor cranial nerve nuclei

Answer 1

collection of neurons in brainstem that synapse before meeting cranial nerve

Question 2

Name CN I and its function

Answer 2

Olfactory

smell

Question 3

Name CN II and its function

Answer 3

Optic

Vision

Question 4

Name CN III and its function

Answer 4

Occulomotor
Innervates all extrinsic eye muscle (except those innervated by CN IV and VI), the striated muscle of the eyelid, pupillary constriction and accomodation for near vision

Question 5

Name CN IV and its function

Answer 5

Trochlear

innervates superior oblique muscle of eye

Question 6

Name CN V and its function

Answer 6

Trigeminal

• Sensory to skin, muscle, joints, mouth and teeth innervated by opthalmic, maxillary and mandibular divisions
• motor to muscles of mastication

Question 7

Name CN VI and its function

Answer 7

Abducens

innervates lateral rectus muscle of eye

Question 8

Name CN VII and its function

Answer 8

Facial nerve
Sensory to skin of external ear, taste (anterior 2/3 of tongue), motor to muscles of facial expression, secretomotor to lacrimal and salivary glands.

Question 9

Name CN VIII and its function

Answer 9

Vestibulochochlear

heaaring and balance

Question 10

Name CN IX and its function

Answer 10

Glossopharyngeal

Swallowing; innervates carotid body, taste to posterior 1/3 of tongue, autonomic innervation to parotid salivary gland

Question 11

Name CN X and its function

Answer 11

Vagus
Motor parasympathetic; visceral sensation of pharynx, thorax and abdomen; striated muscles of larynx and pharynx- controls speech

Question 12

Name CN XI and its function

Answer 12

Spinal accessory

Innervates trapezius and sternocledoimastoid muscles

Question 13

Name CN XII and its function

Answer 13

Hypoglossal

Innervates muscles of tongue

Question 14

what cranial nerves originate from the cerebrum

Answer 14

CN I (olfactory) and CN II (optic) nerves

Question 15

where do cranial nerves III to XII originate from

Answer 15

Brain stem

Question 16

where does CN III (occulomotor) arise from

Answer 16

Midbrain-pontine junction

Question 17

where does CN IV (Trochlear) arise from

Answer 17

posterior side of the midbrain

Question 18

where does CN V (Trigeminal) arise from

Answer 18

pons

Question 19

where does CN abducens, facial, vestibulocochlear (VI-VIII). arise from

Answer 19

Pontine-medulla junction

Question 20

where does CN glossopharyngeal, vagus, accessory (IX-XI). Anterior to the olive: hypoglossal (XII) arise from

Answer 20

Medulla oblongata

Question 21

where does CN I (olfactory) exit from

Answer 21

Cribriform plate

Question 22

where does CN II (optic) exit from

Answer 22

Optic canal

Question 23

where does CN III, IV, V1, VI (occulomotor, trochlear, trigeminal 1- Opthalmic, abducens) exit from

Answer 23

superior orbital fissure

Question 24

where does CN V2 (maxillary) exit from

Answer 24

foramen rotundum

Question 25

where does CN V3 (mandibular) exit from

Answer 25

foramen ovale

Question 26

where does CN VII and VIII (facial, vestiubulocochlear) exit from

Answer 26

internal acoustic meatus

Question 27

where does CN IX, X and XI (glossopharyngeal, vagus, accessory) exit from

Answer 27

jugular foramen

Question 28

where does CN XII (hypoglossal) exit from

Answer 28

hypoglossal canal

Question 29

how do you elicit a vestibulo-ocular reflex

Answer 29

• rapid head impulse test
• Activation of vestibular system of the inner ear causes eye movements
• during side to side head movement- produces eye movements in the direction oppsite to head movement thus, presenting the image on the centre of the visual field