Elements of histology / by E. Klein.

  • Edward Emanuel Klein
Date:
1884
Catalogue details

Licence: Public Domain Mark

Credit: Elements of histology / by E. Klein. Source: Wellcome Collection.

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    directions, and in reality fill the interstices between the systems of the Haversian or concentric lamellae. Near the external surface of long bones they have pre- eminently a direction parallel to the surface. These are the circuinferential lamellce of Tomes and de Morgan. Fig. 33a.—Compact Bone Substance in Cross Section. a. Concentric lamellae arranged around the Haversian canals, cut across; b, intermediate or ground lamellas. The hone lacunae are seen between the bone lamellae. (Atlas.) The lamellae of compact bone are perforated by per- pendicular petrified fibres, the jjerforating fibres of Sharpey. They form a continuity with the fibres of the periosteum, from which they are developed. Some of these fibres are smaller than the rest, and of the nature of elastic fibres. 67. Spongy bone substance occurs in the end of the shaft, in the apophyses, in short bones, and in the diploe of flat bones. The cavities or meshes of the spongy substance are called Haversian spaces or can- celli; they intercommunicate with one another, and are filled with marrow, which in the young and growing state is generally of the red variety. The firm parts form spicules and septa, called hone traheculce^
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