ANP 1106 Lecture Notes - Lecture 4: Arrector Pili Muscle, Perineum, Apocrine

• School: University of Ottawa
• Department: Anatomy and Physiology
• Course: ANP 1106
• Professor: Jacqueline Carnegie

Document Summary

Functions of the skin: protection: from bacteria, viruses, fungi etc, absorption: sunscreen, sunlight (uv radiation), water (slightly) etc, secretion: sweat (electrolytes and water) etc, heat regulation: cooling and heating up (i. e. goosebumps) etc, aestheti(cid:272)s: (cid:271)eauty. You see light refle(cid:272)ti(cid:374)g off of so(cid:373)eo(cid:374)e"s epider(cid:373)is. Major layers: epidermis the most superficial portions (stratum corneum) and then the basement membrane that anchors all the cells (stratum germinativum, dermis thick layer just below the epidermis. Hair, sweat glands, neurons, etc: subcutaneous layer (hypodermis) mostly fat bodies, and major blood vessels that feed the superficial portions. The epidermis: most superficial layers of skin, approx. 10-30 cells thick: composed of stratified squamous epithelium, cell types: Melanocytes : tend to be scattered in the deepest part of the epidermis (stratum germinativum). Melanin: pigment that ends up in skin, hair and eyes. The more you produce the darker your skin and hair will be.