Corneocyte (Nail plate)

Corneocytes in the nail plate, also known as onychocytes, are the terminal differentiation product of the nail matrix, forming a hard, protective keratinized structure (StatPearls, Anatomy, Nail). These cells are characterized by their flattened shape, lack of nuclei, and a cytoplasm packed with both "hard" (hair-like) and "soft" (skin-like) keratins, which provide the nail its unique mechanical strength (PubMed, PMID: 17373170). While not a therapeutic target in the traditional molecular sense, such as a receptor or enzyme, the nail plate corneocytes represent the primary barrier to the topical treatment of diseases like onychomycosis and nail psoriasis (Journal of Pharmaceutical Sciences, DOI: 10.1002/jps.20531). Drugs like efinaconazole and tavaborole are specifically designed to penetrate this dense, multi-layered cellular matrix to reach the underlying nail bed (PubMed, PMID: 24843809). The arrangement and lipid content of these corneocytes dictate the permeability of the nail, making them a critical consideration in dermatological pharmacology.

Other names

OnychocyteNail plate cellKeratinized nail cellNail keratinocyte

Topical agents penetrate the keratinized matrix of the corneocytes via passive diffusion to reach the nail bed or inhibit fungal growth within the plate.