CN Function And Action

Question 1

What is the Function/Action of CN II- Opitc?

Answer 1

Sensory Nerve: ability to see/vision

Question 2

What is the function of CN III- Occulomotor?

Answer 2

Moter nerve:

• lifts the upper eyelid
• controls pupil dilation
• moves eye vertical and toward middle

Question 3

What is the function of CN IV, Trochlear?

Answer 3

Motor Nerve: Rotates the eyes down and out

Question 4

What is the function/action of CN V, Trigeminal?

Answer 4

Motor and Sensory nerve
Sensory: tactical sensation to the anterior 2/3 of the tongue
Tactile, temperature and pain sensory to these areas
Opthamalic: sense in forehead
Maxillary: sense in cheek
Mandibular: sense in jaw

Motor:

• Muscles of mastication
• muscles in the mylohyoid (the floor of the mouth)

Question 5

What is the function/action of CN VI, Abducens?

Answer 5

Motor nerve: lateral eye movement or abduction

Question 6

Function/Action of CN I- Olfactory

Answer 6

Sensory nerve: The sense of smell

Question 7

What is the function/action of CN VII, Facial?

Answer 7

Sensory and Motor Nerve

Sensory:
-Sense of taste from the anterior 2/3 of the tongue, the floor of the mouth and the palate

Motor:
Innervation of the muscles in the face, cheeks and scalp

Question 8

What is the function/action of CN VIII, Vestibulocochlear?

Answer 8

The sense of hearing

Question 9

What is the function/action of CN IX, Glossalpharyngeal?

Answer 9

Motor and Sensory Nerve

Sensory:

• taste and touch to the POSTERIOR 1/3 of the tongue
• sensation of the velum/soft palate and oral pharynx (the gag reflex)

Motor: muscles of the soft palate, middle constrictor of the pharynx and the muscles of the larynx

Question 10

What is the function/action of CN X, Vagus? And

Answer 10

Sensory and Motor Nerve

Sensory: sensory for abdominal viscera, heart and respiratory apparatus
**can ask patient if there is any new trouble with breathing or heart problems

Motor: muscles of soft palate, constrictor muscles of the pharynx and muscles of the larynx

Question 11

What is the function/action of CN X, Vagus?

Answer 11

M

Question 12

What is the action/function of CN XI, Accessory?

Answer 12

Motor Nerve:

• Sternocleidomastoid
• Trapezius

Question 13

What is the function/action of CN XII, Hypoglossal?

Answer 13

Motor Nerve:
Muscles of the tongue
Depressor of the hyoid bone