Buckmaster's Elements of animal physiology / by John Angell.

  • Angell, John
Date:
1866
Catalogue details

Licence: Public Domain Mark

Credit: Buckmaster's Elements of animal physiology / by John Angell. Source: Wellcome Collection.

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    pack and protect the various oi-gans, retains and supports the animal heat, and forms a store of respiratoiy food always avail- able for the wants of the system when required. Osseous Tissue, Osteine, or Bony Tissue.— If a very thin shaving of compact bone be examined under a microscope it is found to be made up of little Fig. 89. — Microscopic Structure of Bone (Transverse Section), Showing— An Haversian canal, re- presented by the dark central space ; The lacima, forming con- centric rings round the Haversia^t canals ; The ca7taliculii which ra- diate from the Haver- sian canals through the lacuna:, giving the latter a spider-like appear- ' ance ; The hony laf/iellcB, marked off by the coficentnc rows of lacwKS. systems, tenned Haversian systems, containing— I, a central canal, termed zxi Haversia?i canal; 2, con- centric solid lamincB; 3, concentric rows of lacuna, separating the. solid lamina; 4, minute radiating tubes, termed ca7ialiculi, which radiate or diverge from the Haversian canal, and connect it with the various cir- cular rows of lacuna. All true bone manifests this structure. The Haversian canals are minute oval or circular canals discovered by the anatomist Havers. They vary from i -2,500th to I -200th inch in diameter, their average diameter being about 1-500th inch; they are about i-i20th inch distant from each other. They contain the bloodvessels by wliich the interior of the bone is nourished.