Hair growth is one of the most amazing aspects of the human body. And, although you have thousands of hairs all over your body, you probably think nothing of it. Did you know that once a fetus is about 22 weeks old he has developed five million follicles all over his body? And, that is all he will ever have too. Now, what else can we learn about the biology of hair?
Whats It Made Of?
The anatomy of a strand of hair is amazing. First, there is the follicle which is actually embedded into the skin. The hairs grow from the follicle through a shaft. The papilla lies at the base of the follicle as one of the many layers of the follicle. Next, capillaries help to connect the papilla to the blood supply. These surround the bottom of the hair called the bulb.
There are two sheaths that are in place to protect the hair shaft from being damaged surrounding the follicle. In one of them, runs next to the hair shaft and stops at the sebaceous gland. The other, the outer sheath, runs from the glad and stops at the erector pili muscle.
Keratin is dead protein cells that are what make up the hair shaft. The inside layer of them is the medulla. The...
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