# matrix unguis

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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.

## nail ma·trix

[TA]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.

## matrix unguis

See nailbed.

## nail bed

(nāl bed)The area of the corium on which the nail rests; it is extremely sensitive and presents numerous longitudinal ridges on its surface.

Synonym(s): keratogenous membrane (2) , matrix unguis.

Synonym(s): keratogenous membrane (2) , matrix unguis.

## matrix

pl.

*matrices*[L.]1. the intercellular substance of a tissue, such as bone matrix.

2. the tissue from which a structure develops, such as hair or nail matrix.

3. a rectangular arrangement of quantities or symbols.

**bone matrix (1)**

see bone matrix.

**cartilage matrix (1)**

the intercellular substance of cartilage, consisting of cells and extracellular fibers embedded in an amorphous ground substance.

**claw matrix (2)**

the claw bed. Called also matrix unguis.

**correlation matrix (3)**

a square table giving a correlation between each pair of a set of variables. The diagonal elements give the correlation of a variable with itself, namely 1.

**covariance matrix**

similar to the correlation matrix but gives the variances and covariances.

**matrix Gla protein**

part of the organic phase of bones; found tightly bound to the bone morphogenetic protein of Urist.

**transition matrix (3)**

a table of values used in a markov chain mathematical model, giving the probability of a transition from one state to another in a specified time interval.

**matrix unguis**

see claw matrix (above).

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