the.com/follicle
a tiny biological factory that grows you a hair, then evicts it on schedule.
means A follicle is a small sac or cavity in the body, most famously the tiny pocket of skin from which a hair grows and is nourished.
from From Latin folliculus, "little bag" — a diminutive of follis, meaning "bellows" or "inflated ball" (the same root behind "fool," via the idea of a windbag). So a follicle is literally a "tiny pouch," the body's little leather sack tucked beneath the skin.
- head count
- Scalp holds about 100,000 of them.
- born once
- You get all your follicles before birth.
- muscle attached
- A tiny muscle gives you goosebumps.
- life cycle
- Each one rests, sheds, and regrows for years.
- oil rig
- Each pairs with a gland pumping sebum.
for instance
hair follicle — produces hair from dermal papilla cells, ~100,000 on human scalp
ovarian follicle — contains egg cell in mammals, develops during menstrual cycle
lymphoid follicle — immune tissue clusters in spleen and lymph nodes, produces b cells