Notes on physiology / by Henry Ashby.

  • Henry Ashby
Date:
1889
Catalogue details

Licence: Public Domain Mark

Credit: Notes on physiology / by Henry Ashby. Source: Wellcome Collection.

    49/382 page 33
    is thickened by the addition of a layer of the hyahne matrix, distinct from the rest. The cells consist of round, oval, or elongated corpuscles with one or two nuclei : their protoplasm is finely granular. Each lacuna generally contains one cell, but it may contain 2-8 cells; in the latter case, cell-division is pro- ceeding more rapidly than the formation of the ground substance. Hyaline cartilage is modified in different situa- tions :— {a) Temporary.—Cartilage forms a support for the foetus, and a bed for the deposition of the lime salts. The cells are small, for the most part angular, provided with tails, and uniformly scattered through the matrix, except where ossification is proceeding, when they arrange themselves in columns. The matrix is very finely granular. (b) Costal.—The cells are large and collected into groups, and contain oil globules ; near the ex- terior surface the cells are flattened and lie parallel with the surface. The matrix exhibits a tendency to the deposition of lime salts, beginning from the cir- cumference of the cells, though no true bone is formed. The matrix contains some scattered fibres. The cartilages of the nose, thyroid, cricoid, trachea, and bronchi resemble costal, though for the most part no fibres are to be seen in the matrix. (c) Articular.—In the layer near the bone the cells are arranged in columns, though irregularly dis- tributed near the surface. The matrix is not prone to calcify, like rib-cartilage. Near the articular surface the cells resemble the connective-tissue cells of syno- vial membrane. D
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