The hair bulb is the swollen base of a hair follicle deep in the skin. It wraps around the dermal papilla of the hair, and its matrix cells divide rapidly to build the growing hair.
| Location | Base of the hair follicle in the deep dermis or hypodermis |
|---|---|
| Parts |
|
| Nerve Supply | Cutaneous nerves (sensory and sympathetic) |
| Blood Supply | Cutaneous branches of regional arteries (dermal and subpapillary plexuses) |
| Venous drainage |
|
| Lymphatic drainage |
|
Produces the hair shaft and its colour during the growth phase.
Fast-dividing matrix cells are hit by chemotherapy, causing hair loss. In alopecia areata the immune system attacks the bulb. Laser hair removal targets pigment in the bulb.
Hair loss from damage to dividing hair bulb cells.
Autoimmune attack on hair bulbs causing round patches of hair loss.
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