Root sheath
The inner or epidermic coat of the hair follicle is closely adherent to the root of the hair, and consists of two strata named respectively the outer and inner root sheaths.
| Root sheath | |
|---|---|
 Transverse section of hair follicle. | |
| Anatomical terminology |
Outer root sheath
The outer root sheath corresponds with the stratum mucosum (Stratum germinativum and Stratum Spinosum)[1] of the epidermis, and resembles it in the rounded form and soft character of its cells; at the bottom of the hair follicle these cells become continuous with those of the root of the hair.
Inner root sheath
The inner root sheath (IRS) consists of
- a delicate cuticle next the hair, composed of a single layer of imbricated scales with atrophied nuclei;
- Huxley's layer
- Henle's layer
The term "trichilemmal" refers to the outer root sheath.[2] The IRS functions to mould, adhere, as well as participate in the keratinization of growing hair.[3]
References
- "The Common Integument - Gray's Anatomy of the Human Body - Yahoo! Education". Archived from the original on 2008-01-19. Retrieved 2007-12-08.
- trichilemmal: Definition and Much More from Answers.com
- Joshi RS (January 2011). "The Inner Root Sheath and the Men Associated with it Eponymically". International Journal of Trichology. 3 (1): 57–62. doi:10.4103/0974-7753.82119. PMC 3129131. PMID 21769243.
External links
- "Mammal, hair (LM, High)". APC100. Archived from the original on 13 September 2006.
- "Integument System II: Hair". VM8054 Veterinary Histology. Virginia-Maryland College of Veterinary Medicine. Archived from the original on 2000-01-18.
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