What is a hair follicle?
Hair follicle is the structure of the skin from which the hair grows. Throughout the skin there are hair follicles, except lips, hands of hands and foot feet. Hair follicles grow hair by wrapping old cells together.
Hair follicle comes with one or more sebaceous glands that provide sebum, oily substance that helps lubricate hair and skin. Apocrine sweat glands also help lubricate hair follicles of armpits, weaknesses and yards. Areas that have stronger hair growth, such as the scalp, have more sebaceous glands. In addition, the hair follicle is equipped with a sebaceous gland, a muscle fiber puff that creates goose wounds when a goose is formed during download. Hair follicles also have stem cells at their base, which contribute to regular hair growth.
The hair follicle base is called papilla. It consists of connective tissue and capillary loops or small blood vessels. The papilla is Surrous is a hair matrix that consists of epithelial cells and melanocytes.Epithelial cells are divided very quickly and cause regular hair growth, while melanocytes provide pigment and are responsible for hair color.
hair follicle is surrounded by a protective root sheath consisting of an outer and inner root shell. The inner root cloak has three layers: the innermost inner cuticle, the Medial Huxley layer and the layer of outer henle. The inner cuticle is continuous with the farthest layer of hair fiber. The fiber itself also has three layers: a cuticle, an intermediate bark and an inner medulla.
hair growth takes place in four -phase cycles. Anagen is an active growth phase whose length varies greatly between people and individual hair follicles. Anagen lasts two to seven years on human skin, but for only months on the eyebrows. The growth phase is followed by the Katagen, the short phase of the transition, which lasts approximately two to four weeks.
after the catagen begins telogenPhase, resting phase. Hair in the telogen phase is dead and called club hair. Many club hairs are stuck daily from the body. The telogen phase takes about three weeks for hair on human skin. The last phase of the hair follicle cycle is the exogen, the shed phase, in which one of the many hair that can occur from one follicle.