BODY MEMBRANESHCT I

Membrane- A thin sheetlike structure covering and protecting the body surface, line body coavities and cover inner surfaces of the hollow organs (digestive and respiratory)

Two major categories Epitheleal Connective tissue membrane

Epitheleal- composed of epithelial tissue and an underlying layer of specialized connective tissue Three types in the

body Cutaneous

membrane Serous membranes Mucous membranes

1. Cutaneous Membrane

Cutaneous Membrane (the skin) The primary

organ of the integumentary system.

Approximately 16% of body weight

2. Serous Membranes Found only in

closed cavities Made up of two

layers Simple

squamous epithelium

Connective tissue basement membrane that supports the epithelial cells.

Serous Membranes Two types

Parietal- lines the walls of a body cavity

Visceral- covers the surface of the organs.

Named for the cavity the belong to

Pleura- thoracic cavity Peritoneum-abdominal

3. Mucous membrane

Line the body surfaces opening directly to the exterior

Produce mucus to keep the membrane moist and soft

Mucocutanous junction- where skin and mucous membranes meet. (eyelids, nasal opening, anus)

Connective Tissue Membranes

Does not contain epithelial components

Produces a lubricant called synovial fluid Examples

Membranes in the space between joints

Lining of bural sacs

Diseases Pleurisy-

inflammation of the serous membranes that line the chest cavity and cover the lungs Pain is causes by

irritation and friction as the lungs rubs against the walls of the chest.

Peritonitis

Peritonitis- is an inflammation (irritation) of the peritoneum, the thin tissue that lines the inner wall of the abdomen and covers most of the abdominal organs Can be a serious

complication of an infected appendix.

Bursitis

Inflammation of the fluid-filled sac (bursa) that lies between a tendon and skin, or between a tendon and bone.