GI Histology- Oral Cavity

Question 1

KNOW- What are the 3 types of Mucosa in the oral cavity?

Answer 1

• Epithelium
• Lamina Propria
• Muscularis Mucosa

Question 2

Where are glands located within the oral cavity

Answer 2

In the submucosa

Question 3

What is located within the lamina propria layer of the mucosa?

Answer 3

Lymphatic material

Question 4

What are the two divisions of the oral cavity?

Answer 4

Vestibule- space between the lip, cheeks, and teeth

Oral Cavity Proper

Question 5

3 major salivary glands are?

Answer 5

Parotid, submandibular, sublingual

Question 6

The oral cavity is lined by three types of mucosa, they are:

Answer 6

1) Masticatory- on gingiva and hard palate consists of SSE Keratinized and SSE Parakaratinized
2) Specialized- Dorsum of tongue. Has SSE keratinized
3) Lining- everything thats not dorsum of tongue, hard palate or gingiva. SSE nonkeratinized epithelium

Question 7

Specialized mucosa has lingual paillae. Four types, which type does not contain taste buds

Answer 7

Filiform papillae

SO…remember that taste buds are located within lingual papillae except the filiform type

Question 8

What are the 4 types of papillae and where are they located on the tongue?

Answer 8

• Filliform- anterior 2/3 of the tongue. numerous, no taste buds
• fungiform- scattered among filliforms, has taste buds
• Circumvallates- divides anterior 2/3 and pos 1/3, surrounded by a moat. taste buds
• Foliates- lateral edge, taste buds

Question 9

3 kinds of cells in a taste bud

Answer 9

sensory, supporting, basal

Question 10

KNOW that each taste bud contains mixtures of sensory cell types but each sensory cell only contains one type of sensory receptor.

Answer 10

ok

Question 11

five known tastes are

Answer 11

sweet, salt, sour, bitter, umani

Question 12

The ability to taste bitterness is mainly found where

Answer 12

back of tongue

Question 13

Two principle cell types in salivary glands?

Answer 13

• Serous: secrete watery substance with protein, amylasem and lysozyme
• Mucous cells: secrete mucous, which is lost during preparationso that the apical region looks empty. Look for a flat nucleus at the base of the cell.

Question 14

Salivary glands are arranged into clusters of cells called acini. Check out the slide on this

Answer 14

ok

Question 15

Intercalated ducts, part of the salivary gland organization, does what?

Answer 15

its very small and modifies the secretion

Question 16

Striated ducts, part of salivary gland organization, do what?

Answer 16

Also modify the secretion, they are around the same size as an acinus though

Question 17

Interlobular ducts, part of salivary gland organization, do what?

Answer 17

They are found in the interlobular connective tissue and serve purely as conduits for salivary secretion

Question 18

Parotid gland is composed mainly of which of the two principle salivary gland cell types

Answer 18

Serous

Question 19

Submandibular gland = what cell type

Answer 19

mixed but still mostly serous

Question 20

Sublingual gland=

Answer 20

mixed but mostly mucous

Question 21

Which digestive enzymes are contained in saliva?

Answer 21

amylase and lipase