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Dermal papilla

The dermal papilla provides nutrition by extending from the dermis into the hair bulb. The hair bulb is a formation at the bottom of the hair follicle itself, and it is the structure responsible for sprouting the hair shaft up the follicle, past the scalp.
Once the dermal papilla connects to the hair bulb, the hair may receive oxygen from the blood supply and continue its three phases of growth (anagen, catagen, and telogen).