Cranial Nerves & Spinal Tracts

Question 1

CN I

Answer 1

Olfactory
- Smell
- SENSORY

Question 2

CN II

Answer 2

Optic
- vision
- SENSORY

Question 3

CN III

Answer 3

Oculomotor
- Eye movements (up, down, in)
- Constrict pupil
- MOTOR

Question 4

CN IV

Answer 4

Trochlear
- Eye movement (adduct, down)
- MOTOR

Question 5

CN V

Answer 5

Trigeminal
- Sensory: facial sensation, cornea
- Motor: chewing

Question 6

CN VI

Answer 6

Abducens
- Eye movement (abduct)
- MOTOR

Question 7

CN VII

Answer 7

Facial
- Motor: Facial expressions, close eyes,
saliva and tears
- Sensory: Taste (anterior 2/3 tongue)

Question 8

CN VIII

Answer 8

Vestibulocochlear
- Vestibular nerve: equilibrium and balance
- Cochlear nerve: hearing
- SENSORY

Question 9

CN IX

Answer 9

Glossopharyngeal
Sensory: Taste (posterior 1/3 tongue)
Motor:
- Pharynx control
- swallowing
- saliva
- soft palate rising with “ah” sound
- aids in reflex control of BP
- respiration
- gag reflex

Question 10

CN X

Answer 10

Vagus
- MOTOR & SENSORY
- Slows HR and visceral activity (mostly
parasympathetic fibers)
- larynx control, lungs, bronchi
- heart
- stomach, small intestine, gall bladder
- voice production

Question 11

CN XI

Answer 11

Accessory
- MOTOR
- Shoulder shrug (traps)
- SCM

Question 12

CN XII

Answer 12

Hypoglossal
- MOTOR
- Motor function of tongue

Question 13

Lateral Spinothalamic

Answer 13

• SENSORY
• pain, temp, crude touch on opposite side

Question 14

Anterior Spinothalamic

Answer 14

• SENSORY
• Crude touch and pressure

Question 15

Fasciculi gracilis & cuneatous

Answer 15

• SENSORY
• Discriminating touch and pressure sensations (vibration, stereognosis, 2-point discrimination)
• Conscious kinesthesia

Question 16

Anterior & Posterior Spinocerebellar

Answer 16

• SENSORY
• Subconscious kinesthesia

Question 17

Spinotectal

Answer 17

• SENSORY
• Touch related to visual reflexes

Question 18

Lateral Corticospinal

Answer 18

• MOTOR
• Voluntary movement
• Contraction of individual or small muscle groups on the OPPOSITE side.
  - hands
  - fingers
  - feet
  - toes

Question 19

Anterior Corticospinal

Answer 19

• MOTOR
• Voluntary movement
• Contraction of individual or small muscle groups on the SAME side.
  - hands
  - fingers
  - feet
  - toes

Question 20

Reticulospinal

Answer 20

• MOTOR
• Maintain posture during movement

Question 21

Rubrospinal

Answer 21

• MOTOR
• Coordination of body movement and posture

Question 22

Tectospinal

Answer 22

• MOTOR
• Head and neck movement during visual reflexes

Question 23

Vestibulospinal

Answer 23

• MOTOR
• Coordination of posture and balance