Oral mucosa 2

1. ORAL MUCOSA
Dr.Geetha Varghese
Professor
SreeMookambika Institute of Dental Sciences
Kulasekharam

3. Structures and boundaries of Oral cavity
Anatomic locations occupied by the three main types of
mucosa in the oral cavity

4. TYPES OF MUCOUS MEMBRANES
Row 1 Row 2 Row 3 Row 4
0
2
4
6
8
10
12
Column 1
Column 2
Column 3

5. Classification of oral mucosa
Based upon
primary function
served
MasticatoryMucosa(25%)
e.g. gingivaandhardpalate
LiningMucosa(60%)
e.g., buccal,labialandalveolarmucosa
ventral surfaceofthetongue
Floorofthemouth& softpalate
SpecialisedMucosa(15%)
e.g. dorsumandlateralaspectofthetongue
Based upon
keratinisation
Keratinised
- Orthokeratinized
- Parakeratinized
Eg. Masticatorymucosa
Non-keratinized
Eg. Liningmucosa

7. Epithelial Activities
Maturation
Progenitor cells
(Basal&Parabasal)
Stem
Amplif
ying
&

8. Epithelial Maturation
Two Patterns
Keratinized
Epithetium Nonkeratinized Epithelium
ORTH
O
PAR
A

9. Types of Oral Mucosa
w4

10. Keratinization
Definition
It is the process of epithelial maturation whereby the
superficial cells become keratinized squames

11. Keratinized Epithelium Nonkeratinized Epithelium
1.Stratum Basalis
2.Stratum Spinosum
3.Stratum Granulosum
4.Stratum Corneum
1.Stratum Basalis
2.Stratum Intermedium
3..Stratum Superficial

12. Oral Mucosa-Ultra structure
Orthokeratinized oral
epithelium
Nonkeratinized oral
epithelium

13. Membrane coating granule/Odland body/Lamellate
body/keratinosome

14. THE ULTRA LEVEL EVENTS DURING KERATINIZATION
 Tonofilaments Tonofibrils
 Appearance of Odland bodies in the upper spinous layers.
 Protein INVOLUCRIN making the inner cell wall of granularlayer
cells thicker.
 Odland bodies fuses with cell membrane and discharge its contents
into the intercellular space to create a LIPID RICH
PERMEABILITY BARRIER.
 Keratohyalin granules secrete protiens FILAGGRIN& LORICRIN
which will help aggregation of tonofibrils and cross linked by
disulphide bonds and facilitate dense packing of keratin filaments.
 Nucleus and all other cell organelles disappear...cells totally
dehydrate and get densely packed with the protein keratin....results
in keratinized surface SQAMES.