Hair Loss: The Science of Hair
Hair is far more complex than it appears on the surface. We all know that it
not only plays a vital role in the appearance of both men and women, but it
also helps to transmit sensory information as well as create gender
The Origins of Hair
By week 22, a developing fetus has all of its hair follicles formed. At this
stage of life there are about 5 million hair follicles on the body. There are a
total of one million on the head, with one hundred thousand of those follicles
residing on the scalp. This is the largest number of hair follicles a human
will ever have, since we do not generate new hair follicles anytime during the
course of our lives.
Most people will notice that the density of scalp hair is reduced as they
grow from childhood to adulthood. The reason: Our scalps expand as we grow.
Hair has two distinct structures - first, the follicle itself, which resides
in the skin, and second, the shaft, which is what is visible above the