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What is another name for hairs?
pili
What is the shaft of hair?
The superficial portion of the hair, which projects above the surface of the skin.
What is the root of hair?
The portion of the hair deep to the shaft that penetrates into the dermis, and sometimes into the subcutaneous layer.
The shaft and root of the hair both consist of three concentric layers of cells. What are they?
1. Medulla
2. Cortex
3. Cuticle of Hair
What does dark hair tell you about pigment in the medulla? Grey hair? White hair?
Dark hair: large amounts of pigment granules
Grey hair: small amounts of pigment granules
White hair: lack of pigment granules and the presence of air bubbles
Which layer consist of cells the most heavily keratinized?
The cuticle of the hair.
Why does it hurt when you pluck out a hair but not when you have a haircut?
Plucking a hair stimulates hair root plexuses in the dermis, some of which are sensitive to pain. Because the cells of a hair shaft are already dead and the hair shaft lacks nerves, cutting hair is not painful.
What is the hair follicle?
Structure composed of epithelium and surrounding the root of a hair from which hair develops.
What is the epithelial root sheath?
An external root sheath and an internal root sheath, which make up the hair follicle.
What is the dermal root sheath?
The dense dermis surrounding the hair follicle.
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