Health Sciences 2300A/B Lecture Notes - Lecture 2: Stratum Corneum, Adipose Tissue, Keratinocyte
19 Sep 2016
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Hypodermis layer of fat between dermis and muscle below. Looking at someone, you are looking at dead tissue (outside layer is dead). Keratinized squamous epithelium: keratinocytes (tough, carry melanin (form of colour in the skin) granules): Melanin is not produced by keratinocytesust taken up by them: melanocytes (colour granules, uv protection) : Make up 8% of cells in skin. Situates itself like an umbrella over nucleus. Exact same number of melanocytes no matter what the colour of your skin (white, brown, black etc. ) Very pale cells break down melanin very quickly (only difference is how your body breaks down melanin herefore darker skin breaks down melanin slower): merkel cells (sensory) : Responsible for tactile senses (ability to feel touch). Tend to be on bottom near to oxygen (as further you move up the less oxygen there is): langerhans cell (macrophages) : Scavengers go around and pick up toxins among others. Merkel + langerhans= last 2% of cells.
