VASCULAR CHANNELS AND RESORPTION CAVITIES IN THE LONG BONE CORTEX. THE BOVINE BONE

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Abstract
The vascular channel net of compacta in the metacarpal bone of bovines has been studied in 15 specimens of various ages from the 3-month foetus to the 8th year of postnatal life. The bone canals and cavities were filled with Indian ink in longitudinal and cross sections of the shaft about 1 mm in thickness. The characteristics of the various components of the channel net, viz., the primary channels the haversian canals and their anastomitic branches, the resorption cavities have been analyzed. The number, calibre and course of the canals entering the cortex from its periosteal and endosteal aspects have also been studied. Measurements made of the width and length of a fairly large number of resorption cavities in subjects of various ages are reported. The distribution of the cavities in the cortex as well as their various shapes are described and interpreted. The formation of resorption cavities and the laying down of secondary osteonstherein determine a reduction in the number of transverse anastomosing channels and altogether a decrease of the extent of the channel network. Finally the significance of the changes undergone by the vascular channel network in the cortex of long bones during life is discussed.

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