medulla of hair shaft

me·dul·la of hair shaft

the central axis of some hairs, containing a column of large vacuolated and keratinized cells; the medullary portion is surrounded by the cortex.

me·dul·la of hair shaft

(mĕ-dŭl'ă hār shaft)
The central axis of some hairs, containing a column of large vacuolated and keratinized cells; the medullary portion is surrounded by the cortex.