BIOL 2130 Lecture Notes - Lecture 17: Basal-Cell Carcinoma, Psoriasis, Skin Cancer
Document Summary
Hair anatomy: central medulla, cortex surrounds medulla, cuticle on outside of cortex. Most heavily keratinized region of the hair. Dermal and epidermal sheath surround hair root: arrector pili muscle. Pulls hairs upright when person is cold or frightened: sebaceous gland, sudoriferous gland. Nails: scale-like modifications of the epidermis. Heavily keratinized: stratum bassale extends beneath the nail bed. Responsible for growth: lack of pigment makes them colorless. Burns: tissue damage and cell death caused by heat, electricity, uv radiation, or chemicals, associated dangers. Circulatory shock: result in loss of body fluids and invasion of bacteria. First-degree burns (partial-thickness burn: only epidermis is damaged, skin is red and swollen. Second-degree burns (partial-thickness burn: epidermis and upper dermis are damaged, skin is red with blisters. Third-degree burns (full-thickness burn: destroys entire skin layer; burned area is painless, requires skin grafts. Caused by fungal infection: boils and carbuncles. Caused by bacterial infection: cold sores. Metastasizes (moves) to other parts of the body.
