Hair shaft
Hair Shaft
The Hair Shaft (/heər ʃæft/), is the part of the hair that is seen above the skin's surface. It is a keratinous filament growing out of the epidermis.
Etymology
The term "Hair Shaft" is derived from the Old English word "hær" for hair and the Middle English word "schaft" meaning rod or pole, which is indicative of the structure of the hair.
Structure
The Hair Shaft is made up of three layers: the Medulla, the Cortex, and the Cuticle.
- The Medulla is the innermost layer, which is not always present, especially in fine or light-colored hair.
- The Cortex is the middle layer, and it provides the hair's strength, color, and texture.
- The Cuticle is the outermost layer, and it protects the cortex.
Function
The Hair Shaft serves several functions, including protection, regulation of body temperature, and facilitation of evaporation of perspiration. It also plays a significant role in social interactions.
Related Terms
- Hair Follicle: The part of the skin that grows hair by packing old cells together. The Hair Shaft grows from the hair follicle.
- Keratin: A type of protein that makes up the Hair Shaft, as well as the outer layer of the skin and nails.
- Sebaceous Gland: Glands in the skin that secrete an oily substance called sebum that helps to lubricate the Hair Shaft.
External links
- Medical encyclopedia article on Hair shaft
- Wikipedia's article - Hair shaft
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