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Anatomy. Learning Objectives. 1. The nail unit consists of the proximal nail fold, nail matrix, nail bed, and hyponychium. These four structures form what is commonly called the nail. 2. The nail unit develops between the 10th and 17th week in utero by a complex pattern of mesenchymal-ectodermal interactions. 3.
The nail matrix is the active tissue (or germinal matrix) that generates cells. The cells harden as they move outward from the nail root to the nail plate. [ 3 ] The nail matrix is also known as the matrix unguis , keratogenous membrane, or onychostroma. [ 4 ]
Nail matrix (nail root): The matrix (germinative matrix) is the epithelial structure beneath the nail, starting at the most proximal reach of the nail and finishing at the edge corresponding to the edge of the lunula.
The nail unit consist of nail matrix, nail folds, nail bed and hyponychium, and any of these parts has a specific composition and functions. Complete regrowth of a fingernail after avulsion can take 4 to 6 months, and up to 1 year for a toenail. TIPS FOR DIAGNOSIS.
4.1 Introduction. The human nail, the horny covering of the upper surface of the tip of each finger and toe, is a set of complex structures that can most accurately be called the nail unit. The visible nail plate is the ultimate product of the continuous pathway of maturation that occurs in this very active, specialized keratinizing unit.
1 Ιουλ 1985 · MATRIX The ventral surface of the proximal nail fold forms the roof of the proximal nail groove; the nail matrix (see Figs. 2 and 3) forms its floor; the nail plate lies between the two. In fact, the matrix begins just before the roof of the proximal nail groove makes its bend (see Figs. 2 and 3).
