510-4 Oral Cavity Epithelia

Question 1

What type of epithelium is normal skin?

Answer 1

Stratified Keratinized Squamous

Question 2

Name two main characteristics of epidermis.

Answer 2

Avascular and Innervated

think paper cut

Question 3

What’s the difference between an apocrine and eccrine gland?

Answer 3

sweat gland at the hair follicle (apocrine) or on the skin’s surface (eccrine).

Question 4

In nanometers, what is the thickness of thick and thin skin?

Answer 4

400-600 nm for thick

75-150 nm for thin

Question 5

What’s the most abundant cell in the epithelium?

Answer 5

Keratinocytes - By far

Question 6

What are the three histologically distinguishing features of the lip?

Answer 6

Hair follicles and sebaceous glands on outside.
Vermillion border has THIN epithelium with no hair/glands
Oral Mucosa is thicker epithelium with glands

Question 7

Where is a Meisner’s Corpuscle found?

Answer 7

Vermillion border of the lip

amplifies innervation

Question 8

Does the Vermillion Zone have a stratum granulosum? Why?

Answer 8

Yes. The stratification shows distinct layers of keratinization, and the epidermis if fully keritinized and lacks nuclei.

Question 9

Describe the top-layer nuclei in the mucosa.

Answer 9

It is either parakeratinized of non-keratinized.

Therefore, nuclei will be found from base to surface.

Question 10

What distinguishes parakeratinization?

Answer 10

Dark, round nuclei at the surface

PYKNOTIC

Question 11

Name three things comprising the mucosa.

Answer 11

Epithelium
Lamina Propria (the loose CT)
Muscularis Mucosa (thin layer of smooth muscle tissue)

Question 12

What is below the mucosa

Answer 12

The submucosa - loose connective tissue

Question 13

Despite the oral mucosa being either non-keratinized or parakeratinized, what is the most common cell in the epithelium?

Answer 13

Keratinocytes - but exhibit degrees of keratinization

Question 14

The lamina propria in the oral mucosa is equivalent to what layer in the skin?

Answer 14

The dermis (vascular and innervated with connective tissue)

Question 15

How is the oral mucosa different from other mucosa

Answer 15

No muscularis mucosa (this layer does not exist in the mouth)

So, the layer below the lamina propria (dermis equiv) is the submucosa

Question 16

What’s the term for highly defined layers of maturation throughout the mucosal epithelium?

Answer 16

Ortho-keratinized

Question 17

What are the three types of Oral Cavity mucosa?

Answer 17

Masticatory, Lining, and Specialized

gingiva and hard palate / alveolar (below gingiva) labial, buccal, mouth floor, soft palate / tongue surface

Question 18

Histologically describe Lining Mucosa.

Answer 18

Non-keratinized stratified squamous epithelium
Lamina Propria is loose

Permeable due to lack of keratinization (sub-lingual)

Question 19

Histology - difference between para k and keratinized

Answer 19

Para K has no granular layer and Pyknotic nuclei
K has granular layer and no nuclei on surface

Both can be in hard palate

Question 20

Name the five areas of Gingiva

Answer 20

Attached, Free, Margin, Sulcular, and Junctional

Question 21

What’s special about Junctional Gingiva?

Answer 21

Has a second layer of Basal Lamina that attaches to dentin.

Question 22

Where is Specialized Oral Mucosa found?

Answer 22

Found on the dorsal side (upper side) of the tongue.

Question 23

What are the three basic types of mucosa?

Answer 23

Masticating, Lining, and Specialized