HLSC 2465U Study Guide - Final Guide: Stratum Granulosum, Stratum Lucidum, Arrector Pili Muscle
Document Summary
Epidermis 5 layers to the epidermis: stratified squamous epithelium with keratin, the epidermis is avascular and obtains its nutrients from the underlying connective tissue in the dermis. Stratum corneum: no nuclei, contains keratinocytes: stratum lucidum: thick, transparent, protection, no nuclei, stratum granulosum: granular cells, produces keratin, stratum spinosum: spiny cells, stratum basale: where the youngest cells are. Subcutaneous layer: adipose tissue, some hair follicles can extend beneath the dermis, ct. Accessory: sweat glands smaller than sebaceous glands, sebaceous glands bigger, honeycomb structure, simple cuboidal, appear hazy, hair follicles, come with an arrector pilli (goosebumps, and a sebaceous gland. Cells: langerhans cells: immunity (s. spinosum, merkel cells: sensory cells (epidermal-dermal junction, keratinocytes: protection, water resistant (s. basale, melanocytes (in s. basale) give a dark pigment, tyrosine. Thick skin: more keratin and rows, contains all layers of the epidermis, does not have hair follicles, does not contain melanocytes, no pigment, hands and feet.
