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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 Type II Epithelial Keratin 6hf (K6hf) Is Expressed in the Companion Layer, Matrix, and Medulla in Anagen-Stage Hair Follicles

60 citations , December 2003 in “Journal of Investigative Dermatology”

K6hf is found in specific parts of hair follicles, nails, and tongue, and is linked to hair growth and structure.

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

22 citations , September 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.

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