The hair follicle is the organ that controls hair growth. It's a complex structure found within the dermal layer of the skin, composed of 20 different cell types. The hair follicle regulates hair growth through a complex interplay of hormones, neuropeptides, and immune cells.
- Hormones: Androgens, particularly testosterone, play a significant role in stimulating hair growth, especially in men. Other hormones like estrogen and thyroid hormones also influence hair growth.
- Neuropeptides: These signaling molecules can impact hair follicle function and regulate hair growth.
- Immune cells: The immune system plays a role in hair follicle health and can influence hair growth through inflammation and other mechanisms.
The hair follicle is a dynamic mini-organ that undergoes cycles of growth, regression, and rest. This cyclical process is regulated by a complex interplay of genetic and environmental factors.
