Structure of Skin and Integumenary System

Structure of Skin and Integumenary System - STRUCTURE OF...

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S TRUCTURE OF S KIN AND I NTEGUMENARY S YSTEM E PIDERMIS -Figure 5.2 - has no blood vessels avascular cells o blood supply to the epidermis comes from little capillaries in dermis - Stratum Bassale o Base, or bottom of epidermis o Single layered o Highly mitotic o Principle component of stratum bassale is skin stem cellSkin regeneration comes from here These stem cells differentiate into: Keratinocytes o Abundance: 80-90% o Produce keratin, which is a protein, which replaces cell organelles by filling cell with keratin and cell dies; the cells around it make the skin almost impermeable to water and microorganisms Melanocytes o Abundance: 8-18% o Produce melanin, which is a dark brown to black pigment and gives you the shade you have on skin; darker people produce more melanin which is important in vitamin D production and protects from UV rays of sun o Figure 5.4 o Melanocyte secretes melanin right out into environment (interstitial space); cells then take in the melanin and make a cap over the nucleus to
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This note was uploaded on 04/18/2008 for the course BS 212 taught by Professor Zink during the Spring '08 term at University of the Sciences in Philadelphia.

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Structure of Skin and Integumenary System - STRUCTURE OF...

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