BIOL 4334 Lecture Notes - Lecture 15: Stratum Granulosum, Stratum Corneum, Stratum Basale
11 Oct 2016
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Document Summary
Boundary that protects our internal structures from outside harm (bacteria, and much else) Epidermis outer most section of skin. Stratum granulosum middle layer filled with keratin. Stratum basale production zone, produced through meiosis. Consists of nerve endings, blood vessels, hair follicles, glands. Adipose fat stored important for insulation. Can help understand an animals current health condition. Became a necessity for mammals to allow for hunting at night through insulation. Epidermis muscles help hair stand on end. Used during times of stress to make self look larger. Erector pillae muslces make hair stand on end. Nerve endings example being the use of whiskers used for tactile reception. Cuticle outer most layer, includes patterns (cuticular scale) that could help distinguish species and age. Normally transparent but may contain some pigment. Grows to a certain length, stops, sheds, and starts over. Stiff and large hairs such as porcupine quill.
