BIOL 2130 Lecture Notes - Lecture 15: Stratum Corneum, Stratum Basale, Stratum Spinosum
Document Summary
Cutaneous membrane= skin: dry membrane, outermost protective boundary. Superficial epidermis is composed of keratinized stratified squamous epithelium. Underlying dermis is mostly dense (fibrous) connective tissue. Surface epithelium type depends on site: stratified squamous epithelium (mouth, esophagus, simple columnar epithelium (rest of digestive tract) Lines all body cavities that open to the exterior body surface. Moist membranes adapted for absorption or secretion. Surface is a layer of simple squamous epithelium. Underlying layer is a thin layer of areolar connective tissue. Lines open body cavities that are closed to the exterior of the body. Serous membranes occur in pairs separated by serous fluid: visceral layer covers the outside of the organ, parietal layer lines a portion of the wall of ventral body cavity. Synovial membrane: connective tissue only, lines fibrous capsules surrounding joints. Lines tendon sheaths: secretes a lubricating fluid. Protects deeper tissues from: mechanical damage (bumps, chemical damage (acids and bases, bacterial damage, ultraviolet radiation (sunlight, thermal damage (drying out)
