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AIKEN-AUGUSTA’S MOST SALUBRIOUS NEWSPAPER • FOUNDED IN 2006 BODY PARTS, THE OCCASIONAL SERIES
Hair is everywhere. Humans are covered with the stuff, head to toe. The average person has 5 million hair follicles, and only about 100,000, give or take, are on the scalp. The other 4,900,000 can be found everywhere except the palms of our hands and the soles of our feet. Hair is a super-complex topic in many ways. Socially, hair can tell us a lot: that a person is old, that he or she is a rebel or non-conformist, or it can be an indicator of poor or vibrant health. It might suggest a person’s political or religious views, and shaving the head can be a form of punishment or a sign of induction into or membership in a group. Hair is no less complex biologically. It comes in a variety of different colors and consistencies and textures. While we might imagine that a strand of hair is just a long, plain, skinny cylinder, it’s a lot more complex than that. Each individual hair, if you looked at it under a powerful microscope, has an inner core called the medulla. Surrounding it is the cortex, and they are both encased in the outer layer, which is called the cuticle. There is actually a lot more to each and every hair, but those are the three main component. Check out the graphic (right). In short, if someone showed you a cross-section of a human hair and asked you what you’re
looking at, you might guess that it’s a human cell. It is that complex (see p. 10). And we haven’t even mentioned conditioners yet! There are different types of hair growing on various body parts and even different stages of hair growth and production in the womb: “vellus” hair replaces “lanugo” hair on a growing fetus after about 36 to 40 weeks of gestation. But we’re just getting started. The IHSS (Individual Hair Support System, a term we just made up) is almost mind-boggling. It’s out of sight beneath the skin and therefore out of mind, but that doesn’t make it any less amazing. Each strand of hair is born in a follicle below the skin’s surface. The support system includes nerves, blood supply, oil or sebaceous glands, and even tiny muscles called arrector pili attached to each hair. When you’re scared or cold and the hair on your arms or the back of your neck “stands up,” they’re being pulled up by the arrector pili. You’ve got questions What function does hair serve? Why is it straight or curly? What makes hair change its texture during and after pregnancy or chemotherapy? Why does it fall out? Please see HAIR page 10
OCTOBER 20, 2017