Which part of the hair structure provides nutrients to stimulate and maintain hair growth?

The papilla is a crucial component of the hair structure that provides nutrients necessary for hair growth. Located at the base of the hair follicle, the papilla contains a rich supply of blood vessels and connective tissues, which deliver oxygen and essential nutrients to the growing hair. This support from the papilla is fundamental for stimulating and sustaining the growth cycle of hair, allowing it to develop and replenish effectively.

In contrast, the follicle is the structure housing the hair and plays a significant role in anchoring the hair in place but is not directly responsible for nutrient supply. The cortex is the thick, fibrous part of the hair shaft that gives hair its strength and color, while the cuticle is the outer protective layer that covers the cortex. Neither the cortex nor the cuticle provide nutrients for hair growth, emphasizing the distinct function of the papilla in nourishing the hair.