Ch. 6 Dermis
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What fiber is the dermis mostly composed of?
Also contains elastic fibers, reticular fibers, and fibroblasts
What are the two zones in the epidermis?
- Papillary layer and the reticular layer. Vague boundary between the two
•Thin zone of areolar tissue in and near the dermal papilla
•Loosely organized tissue allows for mobility of white blood cells and other defense cells to enter the epidermis if it is compromised (cut, scrape, etc) – we
don’t want bacteria, viruses, etc
to reach our blood vessels found deeper in the dermis!!
•Rich in small blood vessels
- Papillary layer—superficial
- zone of dermis
•Consists of dense, irregular connective tissue
•Stretch marks (striae) occur here (tears in the collagen fibers caused by stretching of the skin due to pregnancy or obesity)
- Reticular layer—deeper
- and much thicker layer of dermis
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