juuksefolliikuleid

Juuksefolliikuleid are microscopic structures within the skin that are responsible for hair growth. Each hair strand originates from a juuksefolliikul. These structures are complex and consist of several parts, including the dermal papilla, hair matrix, and sebaceous gland. The dermal papilla contains blood vessels that supply nutrients to the growing hair, while the hair matrix is a rapidly dividing group of cells that form the hair shaft. The sebaceous gland, attached to the folliikul, produces sebum, an oily substance that lubricates the hair and skin.

The life cycle of a juuksefolliikul involves three main phases: anagen (growth), catagen (transitional), and telogen (resting). During the anagen phase, which can last for several years, the hair grows actively. The catagen phase is a short period where hair growth stops and the follicle shrinks. In the telogen phase, the hair strand rests for a few months before eventually shedding, allowing a new hair to begin growing from the same folliikul. The duration and activity of these phases vary depending on genetics, hormones, and overall health. Conditions like alopecia are often related to issues within the juuksefolliikul, affecting hair density and growth. Understanding the function of juuksefolliikuleid is crucial for comprehending hair biology and various hair-related conditions.