Epithelium

Question 1

Origin of eptihelial cells (which germ layer)

Answer 1

ectoderm

Question 2

Name the 4 types of tissues in body

Answer 2

Epithelial, connective, muscle, nervous

Question 3

2 types of epithelium

Answer 3

1. membranous epithelium

2. glandular epithelium – secrete substances

Question 4

5 characteristics of epithelial tissues

Answer 4

1. Cellularity
2. Polarity
3. Attachment – basement membrane
4. Avascularity
5. Regeneration

Question 5

4 Functions of epithelial tissue

Answer 5

1. Protection
2. Permeability
3. Sensation
4. Secretion

Question 6

2 Classifications of epithelium based on layer

Answer 6

1. Simple

2. Stratified

Question 7

Classifications of epithelium based on shape

Answer 7

1. Squamous
2. Cuboidal
3. Columnar
4. Pseudostratified
5. Transitional

Question 8

What type of epithelium is oral mucosa lined by?

Answer 8

stratified squamous epithelium

Question 9

Which type of epithelium can be referred to as keratinised/ non-keratinised?

Answer 9

Stratified squamous epithelium

e.g. oral mucosa

Question 10

2 constituent layers of oral mucosa?

Answer 10

Epithelium
Lamina propria (loose connective tissue)

Question 11

Layer underneath oral mucosa? What type of connective tissue is it?

Answer 11

submucosa – dense irregular connective tissue

Question 12

Structure & Function of a stratified epithelium

Answer 12

multiple layers of cells –> more difficult to penetrate –> able to withstand strong forces

Question 13

Structure & Function of loose connective tissue

Answer 13

cells are surrounded by a matrix –> flexible –> allow more movement

Question 14

3 Categories of oral mucous membrane (oral mucosa) and exmamples

Answer 14

1. Specialized (e.g. dorsum of tongue)
2. Masticatory (e.g. gingiva & hard palate)
3. Lining (all other areas)

Question 15

4 layers of cells in orthokeratinized epithelium

Answer 15

1. stratum corneum
2. stratum granulosum
3. stratum spinosum
4. stratum basale

Question 16

Significance of interdigitations

Answer 16

Account for mobility of tissue

Question 17

Degree of keratinisation of lining mucosa? In particular, alveolar mucosa?

Answer 17

non-keratinized / parakeratinized

alveolar mucosa: non-keratinized

Question 18

Degree of keratinisation of masticatory mucosa? In particular, palatal mucosa?

Answer 18

Parakeratinized/ orthokeratinized

palatal mucosa: orthokeratinized

Question 19

Degree of keratinisation of specialized mucosa?

Answer 19

very thick parakeratinized/ orthokeratinized on dorsum surface of tongue

Question 20

Name of gland beneath circumvallate papillae

Answer 20

Serous glands of von Ebner

Question 21

4 types of papillae on tongue

Answer 21

1. Circumvallate papillae
2. Fungiform papillae
3. Filiform papillae
4. Foliate papillae

Question 22

Which type of papillae on tongue doesn’t have a taste bud?What does it have instead?

Answer 22

Filiform papillae

They have tactile sensation