Kinesiology 2222A/B Lecture Notes - Lecture 4: Carcinoma, Sebaceous Gland, Sunburn
14 Apr 2016
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Covering layer of skin dead skin issue. 2 layers: epidermis epi above; above the dermis, dermis heart of skin; biggest role thick layer at botom of skin hypodermis is not part of skin as organ; fat, hypo below. 4 cell types: kerainocyte, makes up 90% of epidermis, epithelial cell, straiied squamous, lat plates stacked up on one another, contains pigment melanin. Determines shade of colour of cells that dominate this area afords uv protecion. Kerainocyte isn"t able to take in melanin: merkel cell, sensory nerve tacile simulaion, langerhans cell, macrophages that"s part of immune system, situated higher. 5 layers: basale (stratum aka layer, lower level, a lot of acivity occurs here, many melanocytes located here, merkel cells, furthest from exposure all acivity occurs here, spinosum. Dermis in animals used as leather; place piercings and earrings in this layer very strong; made mostly of connecive issue; lots of collagen ibers.
