Medulla (hair)

The medulla is the innermost layer of the hair shaft. This nearly invisible layer is the most soft and fragile, and serves as the pith or marrow of the hair. Scientists are still uncertain about the exact role of the medulla, but they speculate that it is primarily an extension that is more prominent in depigmented (grey or white) hair .[1]

Anatomy of hair

References

James, William; Berger, Timothy; Elston, Dirk (2005) Andrews' Diseases of the Skin: Clinical Dermatology (10th ed.). Saunders. Page 8. ISBN 0-7216-2921-0.

Skin and related structures

Epidermis	Stratum corneum Stratum lucidum Stratum granulosum Stratum spinosum Malpighian layer Stratum basale
Basement membrane	Basal keratinocyte Lamina lucida Lamina densa
Dermis	Papillary Dermal papillae Reticular

Subcutaneous tissue

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

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