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matrix[ma´triks] (pl. ma´trices) (L.)
1. the intercellular substance of a tissue, as bone matrix, or the tissue from which a structure develops, as hair or nail matrix.
2. a metal or plastic band used to provide proper form to a dental restoration, such as amalgam in a prepared cavity.
bone matrix the intercellular substance of bone, consisting of collagenous fibers, ground substance, and inorganic salts.
cartilage matrix the intercellular substance of cartilage consisting of cells and extracellular fibers embedded in an amorphous ground substance.
nail matrix (matrix un´guis) the nail bed.
the area of the corium on which the nail rests; it is extremely sensitive and presents numerous longitudinal ridges on its surface. According to some anatomists, the nail bed is the portion covered by the body of the nail, the nail bed being only the part on which the root of the nail rests.