KINESIOL 1A03 Lecture Notes - Lecture 5: Stratum Corneum, Epithelial Root Sheath, Pattern Hair Loss
21 Sep 2016
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Document Summary
Subcutaneous layer (aka hypodermis) which attaches the dermis to underlying fascia. Integumentary system also includes the skin, hair, oil and sweat glands, nails and sensory receptors. Functions of skin: regulates body temperature, stores blood, protects body from external environment, detects cutaneous sensations, excretes and absorbs substances, synthesizes vitamin d. Fibers from the dermis anchor the skin to the subq layer which in turn attaches to underlying fascia. Contains pacinian (lamellated) corpuscles that are sensitive to pressure. Keratinocytes: the most numerous of the epidermal cells; produces keratin melanocytes: produce melanin (yellow-red or brown-black pigment) absorbs uv light; transfers melanin to keratinocytes protecting their dna by forming a veil over nucleus. Langerhans cells: arise from red bone marrow to plays an immune role by helping other cells recognize an invading microbe. Merkel cells: contact a merkel (tactile) disc to detect touch sensations. 90% of epidermal cells are keratinocytes arranged in 4/5 layers to produce keratin.
