Which part of a hair contains blood and nervous supply?

The bulb is the portion of the hair that contains both blood vessels and nerve endings, playing a crucial role in hair growth and sensation. Located at the base of the hair follicle, the bulb is where the hair originates and is surrounded by the dermal papilla. This structure is pivotal because it provides the necessary nutrients and enhances the growth of the hair through the blood supply. Additionally, the nerve endings in the bulb contribute to the sensory perception associated with hair follicles, allowing individuals to feel touch and movement associated with their hair.

The follicle, while essential for anchoring the hair and facilitating its growth, does not directly contain the blood supply or nervous tissue. It is primarily responsible for housing the hair and also assists in the formation of the hair shaft. The shaft is the visible part of the hair that extends beyond the skin and is composed mostly of keratin, offering no direct connection to blood or nervous supply. The root refers to that portion of the hair that is embedded within the follicle, and while it is closely associated with the bulb, it does not encompass the entirety of the blood and nerve supply, which is fundamentally located within the bulb itself.