HSC 120 Lecture Notes - Lecture 3: Apocrine Sweat Gland, Stratum Spinosum, Stratum Lucidum
Document Summary
Chapter 3: anatomy of the hair skin and nails. Epidermis: 4 or 5 layers (strata: stratum basale: simple cuboidal epithelial tissue, actively divides to make new epidermis layer of the epidermis. Stratum spinosum and granulosum: superficial to the basal. Stratum corneum: composed of dead, keratin-filled cells that flake off (exfoliate) Papillae: conelike projections of dermis that fit into recesses of the epidermis, possess blood vessel, touch reports, form fingerprints and toe prints. Nutrition: vitamin a and vitamin c are important for healthy skin because they are necessary for collagen production, vitamin a: green and yellow vegetables, dairy products, liver, vitamin c: fruit and green vegetables. Nerve endings: pressure, pain, warm and cold receptors are in deeper parts of the dermis, lamellated and tactile corpuscles are for pressure and touch, free nerve endings are for pain, receptor nerve endings may surround a hair follicle. There are 2 main types of cutaneous glands: sebaceous glands produce oil (sebum, sweat glands.
