Cranial Nerve Lecture

Question 1

What do the somatic motor axons of CN III innervate?

Answer 1

Superior, Inferior, and Medial Rectus

Inferior Oblique

Levator Palpebrae Superioris

Question 2

What somatic motor function does CN IV innervate?

Answer 2

Superior Oblique muscle

Question 3

What somatic motor function does CN VI innervate?

Answer 3

Lateral Rectus muscle

Question 4

What innervates all of the intrinsic and extrinsic muscles of the tongue?

Answer 4

CN XII

Question 5

What provides all somatic sensory innervation to the face?

Answer 5

CN V

Question 6

What three cranial nerves provide somatic sensory innervation to the outer ear?

Answer 6

CN VII, IX and X

Question 7

Why can patients with Bell’s Palsy complain of ear aches?

Answer 7

Disruption of precise sensory innervation of outer ear by the facial nerve

Question 8

Where do pre-ganglionic and post-ganglionic neurons synapse for sympathetic innervation to the head?

Answer 8

Superior Cervical ganglion

*Sympathetic innervation arises from T1, T2 spinal nerves

Question 9

Describe parasympathetic innervation of CN III.

Answer 9

Ciliary ganglion

Innervates pupillary sphincter muscle, ciliary muscle

Question 10

Describe parasympathetic innervation of CN VII.

Answer 10

Pterygopalatine ganglion - innervates lacrimal gland, mucus glands of nose palates

Submandibular ganglion - innervates submandibular and sublingual salivary glands

Question 11

Describe parasympathetic innervation of CN IX.

Answer 11

Otic ganglion

Innervates parotid gland

Question 12

Describe parasympathetic innervation of CN X.

Answer 12

Many ganglia in thorax, abdomen

Provides parasympathetic innervation to many organs in thorax and abdomen

Question 13

What nerves provide parasympathetic motor innervation to the head?

Answer 13

III

VII

IX

X

Question 14

What provides parasympathetic sensation innervation to the nasopharynx?

Answer 14

CN VII

Question 15

What parasympathetic sensation does CN IX provide?

Answer 15

Posterior third of tongue

Oropharynx

Tympanic cavity and auditory tube

Carotid sinus

Question 16

What parasympathetic sensation does CN X provide?

Answer 16

Laryngopharynx, larynx in head

Many organs in thorax and abdomen

Question 17

What taste sensation does CN VII provide?

Answer 17

Anterior two thirds of tongue

Question 18

What taste sensation does CN IX provide?

Answer 18

Posterior third of tongue

Question 19

What taste sensation does CN X provide?

Answer 19

Posterior tongue, immediately anterior to the epiglottis

Question 20

What branchiomotor innervation arises from CN V (All from V3)?

Answer 20

Mastication muscles

Mylohyoid

Tensor tympani

Tensor palati

Anterior belly of digastric

Question 21

What branchiomotor innervation arises from CN VII?

Answer 21

Facial Expression muscles

Stylohyoid

Posterior belly of digastric

Stapedius

Question 22

What branchiomotor innervation arises from CN IX?

Answer 22

Stylopharyngeus

Question 23

What branchiomotor innervation arises from CN X?

Answer 23

All muscles of pharynx (except stylopharyngeus)

Muscles of larynx

All muscles of palate (except tensor palati)

Question 24

What branchiomotor innervation arises from CN XI?

Answer 24

Sternocleidomastoid

Trapezius