Innervation

Question 1

What cranial nerves innervate the pharynx?

Answer 1

IX (Glossopharyngeal) and X (Vagus)

Question 2

What nerves are responsible for motor innervation of the pharynx?

Answer 2

Glossopharyngeal (IX)
Vagus (X)
Allied spinal accessory (XI)
Recurrent laryngeal nerve

Question 3

What nerves are responsible for sensory innervation of the pharynx?

Answer 3

Glossopharyngeal (IX to oropharynx region)

Vagus (X) to remainder of pharynx

Question 4

What are the muscles of mastication?

Answer 4

Masseter, Temporalis, Pterygoideus externus, Pterygoideus internus

Question 5

What are the muscles of the tongue?

Answer 5

Styloglossus, Hyoglossus, Genioglossus, Palatoglossus

Question 6

What are the muscles of the palate?

Answer 6

1. Palataglossus, Palatopharyngeus, Levator palatal muscle

Question 7

What CN(s) innervate(s) the larynx?

Answer 7

Vagus (X); RLN all except CT (which is the SLN)

Question 8

What are the muscles with attachments to the hyoid?

Answer 8

Mylohyoid, Anterior belly of digastric, Geniohyoid, Posterior belly of digastric, Stylohyoid

Question 9

What CN innervates the muscles of mastication?

Answer 9

CN V (mandibular branch of trigiminal nerve)

Question 10

Describe tongue innervation for sensation.

Answer 10

Anterior 2/3:

• General sensation- lingual nerve (V3)
• Taste- Chorda Tympani (VII)

Posterior 1/3:

• General sensation- glossopharyngeal (IX)
• Taste- glossopharyngeal (IX)

Question 11

What CN(s) innervate(s) the muscles of the tongue?

Answer 11

CN XII; Except palatoglossus –> Pharyngeal plexus

Question 12

What CN(s) innervate(s) the muscles of the palate?

Answer 12

CN X , XI and cervical sympathetic fibers

(pharyngeal plexus)

Question 13

What CN(s) innervate(s) the muscles of the hyoid?

Answer 13

CN V (Trigeminal), CN XII (Hypoglossal) , CN VII (Facial)