Oral Mucosa

Question 1

Function of oral mucosa (have to briefly explain in exam)

Answer 1

Protection
Secretion
Sensation
Thermal regulation

Question 2

Protection (oral mucosa)

Answer 2

Protect soft tissue from mechanical forces and surface abrasions from hard particles in diet
Act as a barrier from the toxic effects of microorganism

Question 3

Sensation

Answer 3

Receptors respond to the temperature, touch and pain
Tongue has taste bud

Question 4

Secretion

Answer 4

Secret saliva to maintain the moisture of the oral cavity

Question 5

Thermal regulation

Answer 5

Only for animal

Dog remove heat from body throughout the oral mucosa by panting

Question 6

Layers of oral mucosa

Answer 6

1) Oral epithelium
2) Basement membrane
3) Lamina Propria
4) Submucosa layer
5) Mucoperiostium

Question 7

submucosa and its function

Answer 7

A layer of loose fatty or grandular connective tissue containing major blood vessels& nerve supply

separates oral mucosa from underlying bone or muscle

composition determines the flexibility of the attachment of oral mucosa to underlying structures

Question 8

Where submucosa found in

Answer 8

Cheek
lips
hard palate near the molar area

Question 9

Sebaceous gland appear as pale yellow spots known as?

Answer 9

Fordyce’s spots
Fordyce’s disease

Question 10

Two types of oral epithelium

Answer 10

1) Stratified Squamous Keratinized Epithelium:

Orthokeratinized& Parakeratinized

2) Stratified squamous Nonkeratinized Epithelium

Question 11

Cell layers in Stratified squamous keratinized epithelium

Answer 11

1) Basal Layer (Stratum Basale) : Cuboidal/ columnar cells adjacent to basal lamina

2)Prickle Layer (Stratum spinosum) : 8-10 layers
Large elliptical/ spherical cells

3) granular layer (Stratum Granulosm) : 3-5 layers
Large flattened cells contains keratohyalin granules

4) Stratum Corneum (Cornified layer) : 10-20 layers Squamous cells (flat cells) in which all organelles are lost.

Question 12

Orthokeratinization

Answer 12

No nuclei in the keratin layer

Question 13

Parakeratinization

Answer 13

Contain nuclei in keratin layer
only few scattered granules in granular layer

Question 14

Cell layers in stratified squamous Non-keratinized epithelium

Answer 14

Basal layer (Stratum basale)
Intermediate layer (Stratum intermedium)
Superficial layer (Stratum superficial)

No granular layer
superficial layer contain nuclei

Question 15

10% of cell populations in oral epithelium consists of

Answer 15

1) Pigment-producing cells or melanocytes
2) Langerhans cells
3) Merkel cells
4) Inflammatory cells

Question 16

Two types of pigment-producing cell (Melanocytes)

Answer 16

Endogenous
Exogenous

Question 17

Basement Lamina/ basement membrane

Answer 17

Where lamina propria meets the overlying oral epithelium
Increase area of interface and create a stronger attachment

Question 18

Basement membrane of Masticatory mucosa

Answer 18

Increase papillae and longer epithelial rete pegs

Question 19

Basement membrane of Lining mucosa

Answer 19

Fewer papillae and shorter ridges

Question 20

Lamina Propria (Corium)

Answer 20

Connective tissue that support oral epithelium

Question 21

Two layers of lamina propria

Answer 21

Papillary layer (with epithelial ridges)
Reticular layer (Netlike)

Question 22

Papillary layer

Answer 22

consist loose connective tissue within the connective tissue papillae

•Equal amount of fibers, cells and intercellular
substance.

Question 23

Reticular layer (dense layer)

Answer 23

consist dense tissue and large amount of fibers

deeper portion

Question 24

What is between papillary layer and the deepest layers of the lamina propria

Answer 24

Capillary plexus

Question 25

Function of capillary plexus

Answer 25

provides nutrition for all mucosa and send capillaries into connective tissue papilla

Question 26

Composition of lamina propria

Answer 26

1) Cells i) Fibroblasts- major ii) Macrophages iii) Mast cells iv) Inflammatory cells 2) Fibers i) collagen i) elastic fibers 3)Ground substances i) Proteoglycans ii) Glycoprotein 4) Blood vessels 5)Nerves

Question 27

Organization of oral mucosa

Answer 27

Lining mucosa- 60% Masticatory mucosa- 25% Specialized mucosa- 15%

Question 28

Mucoperiostium

Answer 28

oral mucosa is attached directly to the periostium of underlying bone with no interverning submucosa. • provides a firm & inelastic attachment. • Can be found at Attached gingiva and parts of the hard palate.

Question 29

Alveolar mucosa histology

Answer 29

Example of lining mucosa Thin non-keratinized epithelium. • Extensive vascular supply in the lamina propria. • Reddish pink-tissue. • Numerous of elastic fibers in lamina propria– mobile tissue. • Sub-mucosa is loosely attached to the underlying muscle/ bone