Lining Mucosa: Histology And Its Role In Oral Surgery

Lining Mucosa: Histology And Its Role In Oral Surgery

Describe the lining mucosa.
Answer:

• The oral mucosa covering the underside of the tongue, inside of the lips, cheeks, floor of the mouth vestibule, and alveolar mucosa are classified as lining mucosa.
• The mucous membrane is movably attached to the deep structures and does not restrict the movement of lips, cheeks, and tongue.
• Where the lining mucosa covers muscle, the mucosa is fixed to the fascia.

Lining Mucosa Clinical considerations:

• Surgical incisions require sutures for closure.
• Injections are easy due to the ready dispersion of fluids.
• Infections spread rapidly.

Lining Mucosa Histology:

1. Epithelium.

• Thick (400 pm)
• Non-keratinized stratified squamous epithelium.
• The surface is flexible to withstand stretching.

2. Junction between epithelium and lamina propria.

• Smooth
• Slender connective tissue papillae often penetrate into the epithelium.

3. Lamina propria.

• Thicker
• Contains fewer irregular collagen fibers.
• This helps the mucosa to be stretched to a certain extent.
• Also contains elastic fibers to control the extensibility of the mucosa.

4. Submucosa.

• The mucosa of the soft palate is separated from the loose and highly glandular submucosa by a layer of elastic fibers.

Attachments:

1. Lining mucosa covering the muscle.

• Attached by a mixture of collagen and elastic fibers

2. the alveolar mucosa and mucosa covering the floor of the mouth.

• Attached loosely to the underlying structures by a thick submucosa.

3. Mucosa of the underside of the tongue.

• Bound firmly to the underlying muscle.

Lining Mucosa  Functions:

1. Collagen fibers.

• Helps to stretch the mucosa to a certain limit.

2. Elastic fibers.

• Tend to control the extensibility of the mucosa.
• During mastication.
• Retract the mucosa toward the muscle.
• Prevent it from bulging between the teeth and being bitten.
• Tend to restore the mucosa to its resting position after detention.