Functional Components of Cranial Nerves

Question 1

CN I Olfactory Nerve
Motor and/or Sensory?
Function?

Answer 1

Sensory

Function: Smell

Question 2

CN II Optic Nerve

Answer 2

Sensory

Function: Vision

Question 3

CN III Oculomotor Nerve
Motor and/or Sensory?
Function?

Answer 3

Motor

Function:
- Elevates eyelid (Innervation to Levator Palpebrae Muscle)
- Turn eye up, down and in (Medial)
- Pupil Constriction
- Lens Accommodation

Question 4

CN IV Trochlear
Motor and/or Sensory?
Function?

Answer 4

Motor (Somatic)

Turns eye Down and In. (Superior Oblique)

“SO4 - LR6”

Question 5

CN V Trigeminal
Motor and/or Sensory?
Function?

Answer 5

Mixed (Motor + Sensory)

Function:
- Sensation from Face
- Sensation from Cornea
- Sensation from Anterior Tongue
- Muscles of (Mastication)
- Sound Dampening (tensor tympani)

Question 6

CN VI Abducens
Afferent and/or Efferent?
Function?

Answer 6

Motor (Somatic)

Turns Eye Out (Abducts Eye)

"”SO4 -LR6”

Question 7

CN VII Facial
Motor and/or Sensory?
Function?

Answer 7

Motor and Sensory

Functions:
- Taste from Anterior 2/3 Tongue
- Muscles of Facial Expression
- Tearing (Lacrimal Gland)
- Sound Dampening

Question 8

CN VIII Vestibulocochlear
Afferent and/or Efferent?
Function?

Answer 8

Sensory (Afferent)

Function:
- Balance
- Hearing

Question 9

CN IX Glossopharyngeal
Motor and/or Sensory?
Function?

Answer 9

Motor and Sensory

Function:
- Taste from Posterior 1/3 Tongue
- Sensation from Posterior 1/3 Tongue
- Salivation (Parotid Gland)

Question 10

CN X Vagus Nerve
Motor and/or Sensory?
Function?

Answer 10

Motor and Sensory

Function:
- Thoracic and Abdominal Viscera
- Muscles of Larynx and Pharynx
- Decreases HR
- Increase GI Motility

Think Parasympathetic Control

Question 11

CN XI Spinal Accessory Nerve
Motor and/or Sensory?
Function?

Answer 11

Motor

Function:
- Innervation of the SCM and Trapezius

Question 12

CN XII Hypoglossal
Motor and/or Sensory?
Function?

Answer 12

Motor

Function
- Tongue Movements and Shape