What shape does the hair bulb have?

The hair bulb is shaped like a cone, which is essential for its function in the hair growth cycle. This cone shape allows the hair follicle to fit snugly into the dermal papilla, which is a small, bulb-like structure at the base of the hair follicle that contains blood vessels and nerve endings. The conical shape helps to anchor the hair follicle securely into the surrounding tissue, providing the necessary support for hair growth and nourishment from the blood supply. This anatomical design is critical because it maximizes the surface area for nutrient exchange, which is vital for the development and growth of healthy hair. The other shapes listed do not accurately represent the bulb's anatomy or its functional relationship with the skin and hair growth process.