Unit III: The Nervous System (Cranial Nerves)

Question 1

How many pairs of cranial nerves arise form the brain?

Answer 1

12 pairs

Question 2

Chemoreceptors

Answer 2

smell and taste

Question 3

Photoreceptors

Answer 3

Light- vision

Question 4

Mechanoreceptors

Answer 4

hearing and balance.

Question 5

Olfactory Nerve
(Roman Numeral, sensory or motor and function)

Answer 5

I- Sensory for smell

Question 6

Optic Nerve
(Roman Numeral, sensory or motor and function)

Answer 6

II- Sensory for vision.
Photoreceptors- behind eyeballs.

Question 7

Oculomotor Nerve
(Roman Numeral, sensory or motor and function)

Answer 7

III- Motor fibers for eye muscles.
Moves eyeballs around.

Question 8

Trochlear
(Roman Numeral, sensory or motor and function)

Answer 8

IV- Motor fibers to eye muscles.
Allows movement from side to side and up and down.

Question 9

Trigeminal Nerve
(Roman Numeral, sensory or motor and function)

Answer 9

V- sensory for the face and motor to chewing muscles.

Question 10

Abducens Nerve
(Roman Numeral, sensory or motor and function)

Answer 10

VI- Motor fibers to eye muscles
Lateral eye movement

Question 11

Facial Nerves
(Roman Numeral, sensory or motor and function)

Answer 11

VII- Sensory for taste and motor to the face
Parasympathetic control of salivary glands.

Question 12

Vestibulocochlear Nerve (Roman Numeral, sensory or motor and function)

Answer 12

VIII- Sensory for balance and hearing.

Question 13

Glossopharyngeal Nerve (Roman Numeral, sensory or motor and function)

Answer 13

IX- Sensory for taste and motor to the pharynx.

Question 14

Vagus Nerve
(Roman Numeral, sensory or motor and function)

Answer 14

X- Sensory and motor fibers for the pharynx, larynx, and viscera.

Question 14

Accessory Nerve
(Roman Numeral, sensory or motor and function)

Answer 14

XI- Motor fibers to the neck and upper back.

Question 15

Hypoglossal Nerve
(Roman Numeral, sensory or motor and function)

Answer 15

XII- motor fibers to the tongue

Question 16

How is I- Olfactory nerve tested?

Answer 16

Ask subjects to distinguish among different odors.

Question 17

How is II-Optic nerve, III- Oculomotor, IV- Trochlear , VI- Abducens tested?

Answer 17

Assessed while vision and eye movement are checked. Have subject hold head still and track the movement of the finger with the eyes.

Question 18

How is V-Trigeminal nerve tested?

Answer 18

Motor- Ask the person to clench their teeth.
Palpate the jaw muscles
Sensory- lightly touch areas of the face and forehead.

Question 19

How is VII- Facial nerves tested?

Answer 19

Motor- ask the person to perform head movements.
Raising eyebrows, pursing lips, and smiling.
Sensory- place solutions known to stimulate the taste receptors on the anterior 2/3 of the tongue.

Question 20

How is VIII- Vestibulocochlear nerve tested?

Answer 20

Checkin hearing using a tuning fork

Question 21

How is IX Glossophraryngeal and X-Vagus nerve tested?

Answer 21

watch individuals swallow something.

Question 22

How is the XI- Accessory nerve teste?

Answer 22

Ask the person to shrug the shoulders. Loos at sternocleidomastoid or trapezius for signs of atrophy.

Question 23

How is XII- Hypoglossal nerve tested?

Answer 23

Have the person extend their tongue and move it from side to side.