FXN of 12 Cranial Nerves

Question 1

CN I - Olfactory (sensory)

Answer 1

smell

Question 2

CN II - Optic (sensory)

Answer 2

vision

Question 3

CN III - Oculomotor (motor)

Answer 3

• Raise eyelid (levator palpebrae)

- Moves the eye up, down, and ADDucts (superior rectus, medial rectus, inferior rectus, & inferior oblique).

Question 4

CN IV - Trochlear (motor)

Answer 4

Moves eye down and ABducts
- controls superior oblique

*SO4(LR6)

Question 5

CN V - Trigeminal (both)

Three Branches:

• opthalmic (v1) of CN V
• Maxillary (v2) of CN V
• Mandibular (v3) of CN V

Answer 5

(Sensory) 
- touch, temp. positions head.
- proprioception for muscles of mastication
(Motor)
- Chewing, opens jaw, moves soft palate.

Question 6

CN VI - ABducens (motor)

Answer 6

ABducts eye (controls lateral rectus)

• SO4(LR6)

Question 7

CN VII - Facial (both)
- 6 Branches
1. Temoral 
2. Zygomatic
3. Buccal 
4. Mandibular
5. Cervical 
6. Posterior
 auricular

Answer 7

• moves facial muscles, lacrimal and nasal gland secretions, submandibular and sublingual glands, tympanic membrane, external ear canal sensations and taste on anterior ⅔ of tongue.

Motor components

1. Temporal branch: frontalis and orbicularis oculi
2. Zygomatic branch: orbicularis oculi, zygomaticus major and minor
3. Buccal branch: buccinator, orbicularis oris, zygomaticus, levator labii superioris
4. Mandibular branch: orbicularis oris and depressor labii inferioris
5. Cervical branch: platysma
6. Posterior auricular- occipitalis

Question 8

CN VIII - Vestibulocochlear (sensory)

Answer 8

hearing and balance

Question 9

CN IX - Glossopharyngeal (both)

Answer 9

-elevates pharynx during swallowing, secretion of parotid gland, senses arterial oxygen and blood pressure,

Touch: posterior ⅓ tongue, palate, middle ear, inner surface of ear drum,

Taste: posterior ⅓ tongue

Question 10

CN X - Vagus (both)

Answer 10

• Speaking and swallowing
• visceral smooth muscle activity
• slow heart rate and sensory feedback from visceral organs,
• touch pain temp from larynx pharynx auditory canal and tympanic membrane, -
  taste from epiglottis

Question 11

CN XI - Spinal Accessory (motor)

Answer 11

Movement of neck and shoulders & speech

Question 12

CN XII - Hypoglossal (motor)

Answer 12

tongue movement