510-05 Oral Cavity Epithelia

Question 1

What are the functions of the oral cavity?

Answer 1

1) nutrient ingestion and initial digestion
- eating, drinking, chewing, sucking, swallowing
- taste
- production of saliva

2) communication
- speech, singing
- facial expressions

3) immunological responses
- reactions of lymphoid tissues

Question 2

What are the 3 basic types of mucosa?

Answer 2

masticatory, lining, and specialized

Question 3

What kind of tissue is found in hypodermis?

Answer 3

adipose tissue

Question 4

Which of the skin layers contains the largest blood vessels?

Answer 4

hypodermis

Question 5

What are the 2 types of sweat glands?

Answer 5

apocrine and eccrine

Question 6

The epidermis is a ____ _____ ____ epithelium

Answer 6

keratinized stratified squamous epithelium

Question 7

What determines the thickness of the epithelium?

Answer 7

the number of layers of keratinocytes and the presence or absence of hair

Question 8

(T/F) Thick skin has hair and is found everywhere in the body

Answer 8

False, thick skin has no hair and is only found on palms and soles. Thin skin has hair and covers the rest of the body

Question 9

What are the most abundant cells of the epithelium in the epidermis?

Answer 9

keratinocytes

Question 10

What are the pigment cells in the basal layer of the epithelium?

Answer 10

melanocytes

Question 11

What are the bone marrow-derived cells in the epidermis that can migrate into the dermis to present antigens to T lymphocytes?

Answer 11

Langerhans/dendritic cells

Question 12

Which epidermal cells act as a sensitive mechanoreceptor (important for sensitivity)?

Answer 12

Merkel’s/tactile cells

Question 13

The stratum lucidum is a transition layer between the stratum ___ and the stratum ___. Where is it best seen?

Answer 13

granulosum, corneum. Palms and soles

Question 14

What is the muscle that surrounds the lips? What bones does it attach to?

Answer 14

orbicularis oris. No bones, inserts into itself.

Question 15

Does the vermillion border have hair or glands?

Answer 15

no

Question 16

The nerve endings in the vermillion zone of the lip are surrounded by nerve corpuscles called ___ ___.

Answer 16

Meissner’s corpuscles

Question 17

Is the epithelium of the vermillion zone keratinized?

Answer 17

yes

Question 18

Does the vermillion zone have salivary glands? Sebaceous glands?

Answer 18

no salivary glands. Has a few sebaceous glands

Question 19

Which part of the lip has thick, stratified nonkeratinized or parakeratinized squamous epithelium?

Answer 19

oral mucosa

Question 20

In parakeratinized squamous epithelium, there are some dead surface cells, but most surface cells have ____ (dark and shrunken) nuclei.

Answer 20

pyknotic

Question 21

What are the general layers of the digestive tract?

Answer 21

1) mucosa
2) submucosa
3) muscularis externa
4) adventitia or serosa

Question 22

Which layer of the digestive tract is loose connective tissue with vessels, nerves, and glands?

Answer 22

submucosa

Question 23

Describe the inner and outer layers of the muscularis externa

Answer 23

1) inner circular layer of smooth muscle

2) outer loingitudinal layer of smooth muscle

Question 24

Oral epithelium is an avascular layer of cells resting on a basal lamina of type ___ collagen

Answer 24

IV

Question 25

What kind of epithelial tissue makes up oral epithelium?

Answer 25

stratified squamous epithelium

Question 26

(T/F) Cells of the oral epithelium are mostly melanocytes

Answer 26

FALSE, they are mostly keratinocytes

Question 27

Lamina propria in the oral mucosa is equivalent to which layer of the skin?

Answer 27

dermis

Question 28

In lamina propria of the oral mucosa, connective tissue papillae interdigitate with ridges of epithelial cells called ____ ridges

Answer 28

rete

Question 29

Is the density of connective tissue fibers higher or lower where the oral mucosa is less mobile?

Answer 29

higher

Question 30

What kinds of cells are found in the lamina propria of the oral mucosa?

Answer 30

fibroblasts, nerve fibers, and inflammatory cells

Question 31

What kind of glands may be present in the upper lip and buccal mucosa in most adults?

Answer 31

sebaceous

Question 32

Describe the muscularis mucosae of the oral mucosa.

Answer 32

The oral mucosa has NO muscalaris mucosae

Question 33

The submucosa is the connective tissue below the ___ ____

Answer 33

lamina propria

Question 34

What are the three types of oral cavity mucosa?

Answer 34

Lining mucosa, masticatory mucosa, and specialized mucosa

Question 35

Which type of oral cavity mucosa is found in the alveolar mucosa, labial mucosa, buccal mucosa, floor of the mouth, inferior surface of the tongue and the soft palate?

Answer 35

lining mucosa

Question 36

Which type of oral cavity mucosa is found in the gingiva and hard palate?

Answer 36

masticatory mucosa

Question 37

Which type of oral cavity mucosa is found on the dorsal surface of the tongue?

Answer 37

specialized mucosa

Question 38

What kinds of structures does lining mucosa cover?

Answer 38

skeletal muscle, bone, and glands

Question 39

What type of epithelium is lining mucosa?

Answer 39

nonkeratinized stratified squamous epithelium

Question 40

Masticatory Mucosa is firmly fixed to underlying bone by dense ____ tissue

Answer 40

connective

Question 41

In masticatory mucosa, the keratinocytes are differentiated into what 4 layers of cells that are similar to thin skin? (name them in order from base layer to surface layer)

Answer 41

- stratum basale - stratum spinosum - stratum granulosum - stratum corneum mnemonic: Bill Sends Grandma Cash

Question 42

In the stratum basale layer of masticatory mucosa, what kind of junctions attach cells to lamina propria?

Answer 42

hemidesmosomes

Question 43

In the stratum spinosum layer of masticatory mucosa, what kind of junctions anchors cells to other cells?

Answer 43

desmosomes

Question 44

In the stratum granulosum layer of masticatory mucosa, cells are filled with what kind of granules?

Answer 44

keratin

Question 45

In the stratum corneum layer of masticatory mucosa, are the keratinized cells permeable or impermeable?

Answer 45

They are relatively impermeable

Question 46

What kind of epithelium tissue makes up masticatory mucosa?

Answer 46

keratinized stratified squamous epithelium and in some areas parakeratinized stratified squamous epithelium

Question 47

In masticatory mucosa, what structures interdigitate deeply with the underlying connective tissue? What does this accomplish?

Answer 47

rete ridges. Anchors the mucosa and protects it from shearing stress

Question 48

What causes epithelial cells to exhibit differentiation?

Answer 48

different levels of keratinization

Question 49

In parakeratinized epithelium, the nuclei are described as ____

Answer 49

pyknotic

Question 50

Clusters of yellowish sebaceous glands in the oral mucosa are called ____ ____

Answer 50

Fordyce's granules

Question 51

What are Fordyce's granules?

Answer 51

clusters of yellowish sebaceous glands in the oral mucosa