Holden's human osteology : comprising a description of the bones with delineations of the attachments of the muscles, the general and microscopic structure of bone and its development / edited by Charles Stewart and R.W. Reid.

  • Luther Holden
Date:
1887
Catalogue details

Licence: Public Domain Mark

Credit: Holden's human osteology : comprising a description of the bones with delineations of the attachments of the muscles, the general and microscopic structure of bone and its development / edited by Charles Stewart and R.W. Reid. Source: Wellcome Collection.

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    Fig. 7. the blood the bone salts, to deposit them in and around the fibres of the membrane, and to become themselves bmied in the fabric of the bone, as the bricks of a building are in the mortar. From the centre of ossification the deposit of bone shoots out in needle-Hke rays (trabeculte) towards the cncumference, as shown in the annexed wood-cut (fig. 7). Under a high power the rays of bone can be seen covered with layers of osteoblasts, by which the trabecule grow in thick- ness. The best ]3lace to study the process is at the points of the rays where the membrane is more or less transparent. From these points fine fibres (osteogenetic fibres) may usually be seen extending between the cells. The fibres may either remain soft or become hardened by hme salts; when surrounded by true bone, they are known as ' nails of GagHardi' or perforating fibres. The osteoblasts that surround the osteogenetic fibres, or lie on the surface of bone, elabo- rate from the blood, and pour out upon their surface the organic sub- stance of the matrix of bone, to which an increasing amount of the lime salts is added. Certain of the osteoblasts getting embedded in the matrix they are forming, are spoken of as the bone corpuscles; the space which contains them, as the lacuna; the canaHcuU being the fine tubes in which the pro- cesses of the bone corpuscles are contauied and by which they are connected with one another and the osteoblasts on the surface. (Plate III. fig. 3.) To see how the bone grows in thickness, a section should be made across the rays where they are a little thicker. Such a section (fig. 8) shows that the rays become connected by cross arches, and thus form channels in which the blood-vessels and DIAGRiMMATIC SKETCH OF PAET . OF AN OSSIFYING PABIETAL BONE OF A FODB MONTHs' FosTus. (From a preparation in the Museum of the Eoyal College of Surgeons.)