Anatomy of Hair. A diagram of hair anatomy appears relatively straightforward, but it's actually one of the most complicated structures in the body. Hair is made up the two separate structures: the hair follicle, which exists below the skin, and the hair shaft, which is the hair we see. The hair follicle is the living part of the hair.
How hypothyroidism negatively affects your stomach acid levels. Just as hypothyroidism can result in the drying out of your skin and hair, it also seems to lower the levels of stomach acid in many thyroid patients, possibly by lowering your amount of parietel cells or lowering their ability to produce gastric acid, aka hypochlorhydria.
The thyroid gland. The thyroid gland is a small butterfly-shaped gland in the neck, just in front of the windpipe (trachea). It produces thyroid hormones, which help regulate the body's metabolism (the chemical processes that occur in the body). The thyroid gland isn't usually noticeable, but if it swells, it produces a lump on the neck known as a goitre. The size of a goitre can vary from person to person.