Chapter 87: Soft Tissues of the Oral Cavity

Question 1

What are the soft tissues of the oral cavity?

Answer 1

Lips and cheeks
Tongue
Oropharynx

Question 2

What is the blood supply to the upper lip?
The lower lips?

Answer 2

Upper: infraorbital artery
Lower: facial artery

Question 3

The tongue is composed almost entirely of what?

Answer 3

skeletal muscle

Question 4

What are the two parts of the tongue?

Answer 4

Root - anchors to oropharynx
Body - attached to oral floor by the frenulum/sublingual fold

Question 5

What are the 3 paired extrinsic muscles of the root of the tongue (controlled by the hypoglossal nerve)?

Answer 5

Styloglossus - pull tongue caudally
Hyoglossus - depress and retract
Genioglossus - depress and protrude

Question 6

What is the lyssa of the tongue?

Answer 6

Tubelike structure of muscle, fat and cartilage on ventral midline.

One theory is that it is a stretch receptor?

Question 7

Papillae are the bumps on the tongue. What are four functions?

Answer 7

1. Protect tongue from objects in mouth
2. assist in prehension of things
3. Taste (gustatory)
4. Facilitate grooming (combs) especially in cats

Question 8

What are the three forms of gustatory papillae?
Two forms of non-gustatory?

Answer 8

fungiform, vallate, foliate

filiform, conical (cats are hooks)

Question 9

What nerves control the soft palate?

Answer 9

CN 9 and 10 (glossopharyngeal, vagus)

Question 10

What are tonsils?

Answer 10

lymph tissues

Question 11

What are the three phases of deglutition (swallowing)?

Answer 11

Oropharyngeal (voluntary oral phase CN 5, 7, 12 / pharyngeal phase is reflex CN 9 and 10)
Esophageal
Gastroesophageal

Question 12

Where is the swallowing center?

Answer 12

In the brainstem