BIOL126 Lecture Notes - Lecture 2: Merocrine, Apocrine, Melanocyte
Document Summary
Two major components: cutaneous membrane, accessory structures, 1. 5-2m squared in area, accounting for about 16% of body weight, first line of defence to protect body against external environment, and informs brain about the environment. Intact skin reduces water loss, prevents pathogen entry, and protects against. Cutaneous membrane has two proteins: epidermis and dermis. Epidermis compromised from stratified squamous epithelium; dermis from areolar /loose connective tissue; and dense, irregular connective tissue. Hypodermis (subcutaneous adipose layer) separates integument from the deep fascia and other organs. Connective tissue fibers of hypodermis interweave with those of the dermis. Stratified squamous epithelium provides mechanical protection and prevents entry of microorganisms. Layers pf strata present: thin skin has four layers, thick skin on soles and palms has fifth layer (stratum lucidum). All epithelium is avascular; so living cells are in the basal layer by the basement membrane or dendritic cells in second layer.
