Root sheath

Root sheath
Transverse section of hair follicle.
Dorlands /Elsevier	s_10/12733034
*Anatomical terminology* [edit on Wikidata]

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;

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 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

External links

Skin and related structures

Skin

Epidermis	Stratum corneum Stratum lucidum Stratum granulosum Stratum spinosum Stratum basale

Basement membrane	Basal keratinocyte Lamina lucida Lamina densa

Dermis	Papillary Dermal papillae Reticular

Root sheath	Outer root sheath Inner root sheath Henle's layer Huxley's layer

Hair shaft	Cuticle Cortex Medulla Bulb with matrix cells Hair follicle

Muscle	Arrector pili muscle

Pilosebaceous unit	Hair sebaceous gland

Nail

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