10.0 Oral Cavity and Pharynges

Question 1

Explain the innervation of the tongue.

Answer 1

Posterior ⅓, both sensation AND taste = glossopharyngeal.

Anterior ⅔ taste = facial

Anterior ⅔ sensory = lingual (branch of the mandibular N. [branch of CN V])

Movement for the entire tongue = hypoglossal

Question 2

Parasympathetic axons in what nerve stimulates parotid salivary secretions?

Answer 2

CN IX

Glossopharyngeal

Question 3

Parasympathetic axons in what cranial nerve stimulates salivary secretion in the sublingual and submandibular gland?

Answer 3

Facial N

Question 4

What stimulates mucus secretion from the sublingual gland?

Answer 4

Sympathetic fibers from the cervical ganglia.

Question 5

Answer 5

Question 6

What nerve can be found deep to the palatine tonsil?

Answer 6

The glossopharyngeal N.

Question 7

What three muscles depress the torus tubarius and open the eustachian tube?

Answer 7

Superior pharyngeal constrictor.

Tensor veli palatini.

Levator veli palatini.

Question 8

What happens if the tensor veli palatini or levator veli palatini are paralyzed?

What nerves innervate them?

Answer 8

Oral contents will reflux into the oral cavity.

Levator veli palatini is the laryngeal branch of the vagus N.

Tensor veli palatini is medial pterygoid (a branch of V3 — off of the trigeminal)