Root sheath

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Root sheath
Transverse section of hair follicle.
Gray's	subject #234 1068
Dorlands/Elsevier	s_10/12733034

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;

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.

The inner root sheath consists of

• (1) a delicate cuticle next the hair, composed of a single layer of imbricated scales with atrophied nuclei;
• (2) Huxley's layer
• (3) Henle's layer

The term "trichilemmal" refers to the outer root sheath.^[2]

References

1. ↑ http://education.yahoo.com/reference/gray/subjects/subject/234
2. ↑ http://www.answers.com/topic/trichilemmal

External links

• root+sheath at eMedicine Dictionary
• http://trc.ucdavis.edu/mjguinan/apc100/modules/Integument/hair/hair3/hair3.html
• http://education.vetmed.vt.edu/Curriculum/VM8054/Labs/Lab15/Lab15.htm

This article was originally based on an entry from a public domain edition of Gray's Anatomy. As such, some of the information contained herein may be outdated. Please edit the article if this is the case, and feel free to remove this notice when it is no longer relevant.

v • d • e Integumentary system
Skin layers	cutis: Epidermis (Stratum corneum, Stratum lucidum, Stratum granulosum, Stratum spinosum, Stratum germinativum/basale) • Dermis Subcutaneous tissue
Skin appendages	glands: Sweat glands (Eccrine, Apocrine) • Sebaceous glands hair: Root of the hair • Hair follicle • Root sheath (Huxley's layer, Henle's layer) nails: Eponychium • Lunula nonhuman: Scale • Feather