Hair:
- The hair is found only in the skin of mammals which are ectodermal in origin.
- The hair is situated in a hair follicle which is formed as in the invagination of the stratum germinativum.
- The base of the hair follicle is everted cup-like which encloses a hair papilla or dermal papilla. The hair papilla is made up of blood vessels & the nerves.
- The hair consists of two parts viz.-hair shaft & hair root.
- The cells of the hair root divide constantly causing the growth of the hair follicle.
The part of the hair shaft inside the hair follicle is covered by two sheaths viz.
1. Huxley’s sheath – Outer
2. Henle’s sheath – Inner & made up of cuboidal cells
