KNES 260 Lecture Notes - Lecture 22: Subcutaneous Tissue, Stratum Spinosum, Abdominal Cavity
10 Sep 2020
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Document Summary
Connects skin and cutaneous membrane to deeper layers (eg. fascia, peritoneal tissue in abdominal cavity) Anchors cutaneous membrane to deeper components of body. Protection of internal organs and structures because it interacts with environment. Excretion: sweat, secrete ammonia, urea salt and water. Temperature maintenance: when it gets too hot, excrete sweat to maintain temperature. Sensory detection: sensation of touch passes through nerves and cells of skin. Layers of thin skin, starting from deepest layer (strata): basale, spinosum, granulosum, corneum. As keratin cells enter into more super cial layer, they die o , and then external layer of epidermis will shed away, and we continue to regrow skin cells every 4-6 weeks. Thick skin: wherever there is more pressure or force transmitting through. On palms of hand, soles of feet. Layers (deep to super cial): basale, spinosum, granulosum, lucidum, corneum. Extra layer of keratin cells that result in thicker layer of epidermis, which provides extra protection.
