Root sheath (hair)
| Root sheath | |
|---|---|
Transverse section of hair follicle. | |
| Anatomical terminology |
The inner or epidermic coat of the hair follicle is closely adherent to the root of the hair, and consists of two layers: the outer and inner root sheaths.
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.[2]
The term trichilemmal refers to the outer root sheath.[3]
Inner root sheath
The inner root sheath (IRS) functions to mould, adhere, as well as participate in the keratinization of growing hair.[4]
The inner root sheath consists of:
- a delicate cuticle next to the hair, composed of a single layer of imbricated scales with atrophied nuclei
- Huxley's layer
- Henle's layer
See also
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.
- ^ Bozkurt, Aysegul (2025-11-05). "PRP Treatment For Hair & Hair Improvement". Retrieved 2025-12-20.
- ^ 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.