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

PROTECTION

SENSATION

LUBRICATION

DEFENSE

ORAL MUCOSA

KERATINIZED EPITHELIUM

NON-KERATINIZED EPITHELIUM

MASTICATORY MUCOSA

SPECIALIZED MUCOSA

LINING 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 mucosa o Ventral surface of tongue o Floor of the mouth o Soft palate

NON-KERATINIZED STRATIFIED SQUAMOUS EPITHELIUM

LAMINA PROPRIA

GENERAL HISTOLOGY FEATURES OF A LINING MUCOSA

SUBMUCOSA

MUSCLE / ADIPOSE TISSUE

SUPERFICIAL LAYER

INTERMEDIATE LAYER

NONKERATINIZED EPITHELIUM

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 epithelium Difficult 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 LAYERThe layer of epithelium superficial to the basal layer Composed of larger, staked,polyhedral shaped cell The cell appear larger or plumper than the basal layer because they have larger amounts cytoplasm

BASAL LAYERo The deepest of the 3 layers o It is a single layer of cuboidal epithelial cell overlying the basement membrane o 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

COLLAGEN FIBRE

PAPILLARY LAYER

NERVE

CAPILLARY BRANCH TO PAPILLA

CAPILLARY PLEXUS DENSE LAYER

SUBMUCOSA Location : deep to lamina propria Overlying 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 lesionpage - 110

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