Health Sciences 2300A/B Lecture Notes - Integumentary System, Adipose Tissue, Dermis
28 Feb 2013
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Document Summary
Integumentary system- large organ that covers the body. Two components of skin epidermis (above) and dermis. Hypodermis is not part of the skin - fat and areolar tissue. Made up of almost entirely epithelial cells, organ must contain multiple tissues. Portion of skin made up of one epithelial tissue -stratified squamous. Keratinized squamous epithelium , keratin is a small protein that gives it integrity and strength. Keratinocytes- carries melanin, pigment that gives colour to substance relates to colour of skin. Melanocytes are cuboidal epithelial cells that actually produce melanin rapidly, keratinocytes take-up melanin and spread it out. As tissues grows the deep keratinocytes are lost as well as tan. Merkel cells- nervous cell, exist in epithelial of the epidermis. Langerhans cells-macrophages , may exists near the middle to clean up tissue. Active layer of epithelial , cells rapidly divide and pushed towards more superficial layers as they die also known as germ layer- highly active and replicated.
