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GlossaryMedulla

innermost layer of a hair strand, often spongy

The medulla is the innermost layer of a hair strand, often composed of soft, spongy cells. While its presence and structure can vary among different hair types and species, it generally plays a role in the hair's overall strength and flexibility.

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research Panax Ginseng Prevents Apoptosis in Hair Follicles and Accelerates Recovery of Hair Medullary Cells in Irradiated Mice

22 citations, June 1998 in “PubMed”

Panax ginseng helps prevent hair follicle cell death and speeds up hair cell recovery after radiation in mice.

research Relative Studies Between Hair Index, Hair Area, And Medullary Index With Age And Sex In Thai Scalp Hair

9 citations, September 2016 in “Forensic science international”

Hair area varies with age and sex, but hair index and medullary index do not.

research Analysis of Lipids in the Medulla of Japanese Hair and Their Function

7 citations, April 2018 in “Cosmetics”

Lipids in Japanese hair help maintain glossiness and structure.

research Ultrastructural Immunolocalization of Involucrin in the Medulla and Inner Root Sheath of Human Hair

7 citations, December 2011 in “Annals of anatomy”

Involucrin helps strengthen the inner parts of human hair.

research New Aspects of the Structure of Human Scalp Hair-II: Tubular Structure and Material Flow Property of the Medulla

1 citations, April 2018 in “PubMed”

The medulla in Asian scalp hair has a tubular structure that allows ions and large molecules to flow through it.

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