Cranial Nerve Main Actions

Question 1

Olfactory (CN I)

Answer 1

Smell, Special Sensory

Question 2

Optic (CN II)

Answer 2

Vision from the retina

Question 3

Oculomotor (CN III)

Answer 3

Inf. division carries presynaptic parasympathetic fiber to ciliary ganglion

Question 4

Trochlear (CN IV)

Answer 4

Muscle Innervation to Sup. Oblique

Question 5

Trigeminal (CN V)

Answer 5

Pseudounipolar Neurons

Question 6

Mandibular (V-3)

Answer 6

Lingual N. carries general sensations from the anterior 2/3 of the tongue

Question 7

Facial (CN VII)

Answer 7

• It’s branch, Chorda Tympani, caries taste/sensation from anterior 2/3 of tongue
• Submandibular ganglion
• Parasympathetic innervation of sublingual salivary glands and lacrimal glad

Question 8

Vestibulocochlear (CN VIII)

Answer 8

Vestibular sensation from semicircular ducts, utricle and saccule related to position and movement of head

Question 9

Cochlear

Answer 9

Hearing from spiral organ

Question 10

Glossopharyngeal (CN IX)

Answer 10

• Motor supply to stylopharyngeus to assist with swallowing
• Parasympathetic to parotid gland
• Taste from post. 1/3 of tongue

Question 11

Vagus (CN X)

Answer 11

Motor to muscles of:
pharynx
intrinsic muscles of larynx
palate and epiglottis
striated muscles in upper 2/3 of esophagus

Parasympathetic:
smooth muscle of trachea
bronchi
digestive tract
cardiac muscle

Question 12

Hypoglossal (CN XII)

Answer 12

Motor to intrinsic and extrinsic muscles of tongue except palatoglossus