LINING MUCOSAPREPARED BY:

MOHD RAHIMI AHMAD ZHARIF FARIHA ADILA

NUR ‘AFIFAH NURUL MUNIRAH

FARAH ALIA NUR ADILA

SITI NUR ZAHIDAH

WHAT IS ORAL MUCOSA ?Oral mucosa is the moist lining of oral cavity , also

known as oral mucous membrane.

GENERAL HISTOLOGICAL FEATURES OF ORAL MUCOSA

GENERAL FUNCTION OF

ORAL MUCOSA

PROTECTION

SENSATION LUBRICATION

DEFENSE

ORAL MUCOSA

NON-KERATINIZED EPITHELIUM

KERATINIZED EPITHELIUM

MASTICATORY MUCOSA

LINING MUCOSA

SPECIALIZED MUCOSA

LINING MUCOSA IS THE TYPE OF MUCOSA NOTED FOR ITS : SOFTER

SURFACE TEXTURE,MOIST SURFACE AND ABILITY YO STRETCH AND BE COMPRESSED ACTING AS A CUSHION FOR THE UNDERLYING STRUCTURES.

ASSOCIATED WITH NON-KERATINIZED STRATIFIED SQUAMOUS EPITHELIUM .

LOCATION :

o Labial mucosa ( inner lip)o Buccal mucosa (inner cheek)o Alveolar mucosao Ventral surface of tongueo Floor of the moutho Soft palate

GENERAL HISTOLOGY FEATURES

OF A LINING MUCOSA

NON-KERATINIZED STRATIFIED SQUAMOUS

EPITHELIUM

LAMINA PROPRIA

SUBMUCOSA

MUSCLE / ADIPOSE TISSUE

NONKERATINIZED EPITHELIUM

SUPERFICIAL LAYER

INTERMEDIATE LAYER

BASAL LAYER

NONKERATINIZED ORAL EPITHELIUM

The most common form of epithelium in the oral cavity

It is the superficial layers of lining mucosa each lining mucosa has at least 3 layers within the

epithelium which are :superficial layer (stratum superficiale)intermediate layer (stratum intermedia)basal layer (stratum basale)

SUPERFICIAL LAYERThe most superficial level in nonkeratinized

epitheliumDifficult to divide exactly between the

superficial layer and the intermedium layer in lining mucosa when viewing histological section

Consist of larger similarly stacked polyhedral epithelial cell with the outer cell flattening into squamos

INTERMEDIATE LAYER The layer of epithelium superficial to the basal

layerComposed of larger, staked,polyhedral –

shaped cellThe cell appear larger or plumper than the

basal layer because they have larger amounts cytoplasm

BASAL LAYERo The deepest of the 3 layerso It is a single layer of cuboidal epithelial

cell overlying the basement membraneo Situated superior to the lamina propria

LAMINA PROPRIA

Location : deep to the basement membrane

Main fiber group : collagen fibers but elastic fibers are present in certain regions of the oral cavity

It made up of 2 layers : papillary & dense

NERVE

CAPILLARY BRANCH

TO PAPILLA

COLLAGENFIBRE PAPILLARY

LAYER

CAPILLARYPLEXUS

DENSE LAYER

SUBMUCOSALocation : deep to lamina propriaOverlying muscle and allowing

compression of superficial tissue – allow to serve in region where a movable is needed (speech , mastication , swallow)

HYPERKERATINIZATION OF BUCCAL MUCOSA

Buccal mucosa usually NONKERATINIZED This tissue undergone chronic physical injury to the area

as a result of : grinding of the teeth

bruxism of the teeth

So, the buccal mucosa shown to larger white, rough, raised calloused lesion

page - 110

Any Question?

THANK YOU