ORAL MUCOUS MEMBRANE:-

KERATINIZED MUCOSA
 Hard palate
 Gingiva (70% para & 30% ortho)

NON – KERATINIZED (stratum cornea absent)
 Soft palate
 Floor of mouth
 Alveolar mucosa
 Sulcular epithelium
 Buccal mucosa

SPECIALISED MUCOSA
 Dorsum of tongue

LAYERS OF MUCOSA
EPITHELIUM
LAMINA LUCIDA
BASEMENT MEMBRANE (contains TYPE IV COLLAGEN)
LAMINA DENSA
CONNECTIVE TISSUE
 Basement membrane connections to epithelium
 Via — desmosoms and hemidesmosomes

LAYERS OF EPITHELIUM
Stratum cornea (surface layer)
Stratum granulosum
Stratum spinosum
Stratum basalis (innermost layer)
 Most common epithelium – squamous epithelium
 No blood supply
 How does epithelium get Nutrition? By diffusion from connective tissue
a) Stratum basalis – highly dividing cells
b) Odland bodies (reserve bodies) – stratum spinosum
c) Stratum granulosm – contains granules that get activated from enzymes and produce keratin for the cornea layer of the epithelium
d) Stratum cornea – keratin deposition


KERATINIZATION
a) Para keratinized (with nuclei) — 70% gingiva
b) Ortho keratinized (devoid nuclei) — 30% gingiva

NON KERATINOCYTES:-
 Free nerve cells
 Melanocytes
 Langerhan cells