Hand-book of physiology / by W.M. Baker and V.D. Harris.

  • Kirkes, William Senhouse, 1823-1864.
Date:
1884
Catalogue details

Licence: Public Domain Mark

Credit: Hand-book of physiology / by W.M. Baker and V.D. Harris. Source: Wellcome Collection.

Provider: This material has been provided by the Augustus C. Long Health Sciences Library at Columbia University and Columbia University Libraries/Information Services, through the Medical Heritage Library. The original may be consulted at the the Augustus C. Long Health Sciences Library at Columbia University and Columbia University.

    83/944 (page 55)
    The blood-vessels enter the Haversian canals both from without, by traversing the Bmall holes which exist on the surface of all bones beneath the periosteum, and from within by means of Bmall channels which extend from the medullary cavity, or from the cancellous tissue. The arteries and veins usually occupy separate canals, and the veins, which are the larger, often present, at irregular intervals, small pouch-like dilatations. The lacunae are occupied by branched cells (hone-cells, or bone- oorpuscles) (fig. 47), which very closely resemble the ordinary branched connec- tive-tissue corpuscles; each of these little masses of protoplasm ministering to the nutrition of the bone immediately surrounding it, and one lacunar corpuscle communicating with an- other, and with its sur- rounding district, and with the blood-vessels of the Haversian canals, by means of the minute streams of fluid nutrient matter which occupy the canaliculi. It will be seen from the above description that bone is essentially connective-tissue impreg- nated with lime salts : it bears a very close resemblance to what may be termed typical connective-tissue such as the substance of the cornea. The bone-corpuscles with their processes, occupying the lacunae and canaliculi, correspond exactly to the cornea- corpuscles lying in branched spaees; while the finely fibrillated structure of the bone-lamella), to be presently described, resembles the fibrillated substance of the cornea in which the branching spaces lie. Lamellae of Compact Bone.—In the shaft of a long bone three distinct sets of lamella} can be clearly recognised. (1.) General or fundamental lamella); which are most easily traceable just beneath the periosteum, and around the medullary Fisr. 47.—Bone corpuscles with their process. - seen in a thin section of human bone. (Kollett.)