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Anatomy: Skin
Lecture 11: The Integument (Skin)
Question | Answer |
---|---|
Skin | Largest organ in the body 1.8 square meters avg. adult 7% of body weight Composed of: 1. Epidermis 2. Dermis |
Epidermis | Thick epithelium Develops from ectoderm Outer layer |
Dermis | Leathery layer of Connective tissue Develops from mesoderm |
Hypodermis | Deep to Dermis fatty layer of adipose and areolar connective tissue Thick in Fat people stores nutrients and insulates body |
Appendages of the Skin | hair, nails, various glands of epidermis into dermis |
Where are dermal ridges found? | surface of palms and soles where skin is thickest |
Why do we have fingerprints? | b/c of dermal ridges |
Functions of skin | 1. prevents hydration 2. |
Why are skin burns bad? | Water is allowed to be released from the damaged epidermis/glycolipid layer, rapid dehydration |