Outer root sheath
Outer root sheath
The outer root sheath (pronunciation: /ˈaʊtər ruːt ʃiːθ/) is a component of the hair follicle that plays a crucial role in hair growth and development.
Etymology
The term "outer root sheath" is derived from the Latin words "exterus" meaning "outer", "radix" meaning "root", and "vagina" meaning "sheath".
Definition
The outer root sheath is the outermost layer of the hair follicle. It is continuous with the epidermis and extends from the skin surface to the base of the hair follicle. The outer root sheath is composed of stratified squamous epithelium and serves as a protective barrier for the hair follicle.
Function
The primary function of the outer root sheath is to protect the hair shaft and the inner root sheath. It also plays a role in the growth and development of the hair follicle. The cells of the outer root sheath can differentiate into various cell types, including sebaceous gland cells and hair matrix cells, contributing to the regeneration and growth of the hair follicle.
Related Terms
- Hair Follicle: The part of the skin that grows hair by packing old cells together. The hair follicle is lined by cells derived from the epidermal (outside) layer of the skin.
- Epidermis: The outermost layer of the skin.
- Hair Shaft: The part of the hair that is visible above the skin.
- Sebaceous Gland: Small oil-producing glands present in the skin of mammals.
- Hair Matrix: The base of the hair follicle, where hair is produced.
See Also
External links
- Medical encyclopedia article on Outer root sheath
- Wikipedia's article - Outer root sheath
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