The formative layer of cells at the base of the fingernail or toenail; the matrix. Also called keratogenous membrane, matrix unguis. It is the area of modified epithelium beneath the nail, over which the nail plate slides forward as it grows [MedicalDictionary: http://medical-dictionary.thefreedictionary.com/nail+bed].
Synonyms: keratogenous membrane; matrix unguis
Hierarchy: 2
Parent: appendages
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