juuksefolliikulisse

A juuksefolliikulisse, or hair follicle, is a small, tunnel-like structure in the epidermis of the skin from which hair grows. These structures are essential for hair production and are found on most parts of the body, with the exception of palms, soles, and mucous membranes. Each hair follicle contains a hair root, which is embedded deep within the dermis. At the base of the follicle is the hair bulb, a swelling where active cell division occurs, producing the cells that form the hair shaft. The sebaceous gland, which produces sebum (oil), is typically associated with each hair follicle, lubricating the hair and skin. The arrector pili muscle, a small muscle attached to the follicle, can contract and cause hair to stand on end, a phenomenon known as goosebumps. The hair growth cycle consists of three phases: anagen (growth), catagen (transition), and telogen (resting). The duration of each phase varies depending on the location of the hair and individual factors, influencing hair length and density. Damage or dysfunction of the hair follicles can lead to various hair loss conditions.