Which structure contains the blood and nerve supply that nourishes the hair?

• A. Arrector Pili
• B. Hair Root
• C. Sebaceous Gland
• D. Dermal Papilla

Answer: (D)

The structure that provides the blood and nerve supply to nourish the hair is the dermal papilla. Located at the base of the hair follicle in the dermis, it contains a network of capillaries that deliver nutrients and oxygen to the growing hair matrix, along with nerve endings that help regulate growth and sensation. The other structures have different roles: the arrector pili is a tiny muscle that makes hair stand up; the hair root is the portion of the hair inside the follicle, not its nourishment center; and the sebaceous gland secretes oil to lubricate the hair and skin.