Kinesiology 2222A/B Lecture Notes - Lecture 4: Carcinoma, Benign Tumor, Immune System
7 Oct 2016
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Document Summary
Skin tells you a lot about a person their age (wrinkles), coarse hands (may have worked a hands on job), their hair (grey = older) Made up primarily of epithelial tissue no vessels (avascular) Keratinized squamous epithelium (cells: keratinocyte (dominant type of cell 90% of epithelial) Carries melanin granules colour pigment, colour can vary depending on the type of melanin: melanocytes (8% of cells in epithelial) Primary site where melanin is produced and excreted where the keratinocytes pick it up. Uv protection (from melanin) acts as an umbrella above the nuclei: merkel cell (1-2%) Tactile senses feeling objects touch your skin: langerhans cell (macrophages) (1-2%) Layers of the skin (stratum: basale (deep) Most active layer in the skin all cell division occurs here: stratus spinosum (spider) Secretes a hydrophobic glycoprotein that prevents water to move through this layer: lucisum. Only in certain areas thick skin (heels of feet, in hands) Made up of dead keratinocytes: corneum.
