. The anatomy of the domestic animals. Veterinary anatomy. Pig. 3.—Ckoss-section of Distal Third of Shaft O! Left Humerus of Horse. Section passea through nutrient foramen and canal. innumerable small branches which enter minute openings (Volkmann's canals) on the surface and reach the Haversian canals of the compact substance. Other branches enter the extremities of the long bones and supply the spongy bone and marrow in them. In the case of the larger bones—and especially the long bones— the large nutrient or medullary artery (Arteria nutricia) enters at the so-called nu- trient foramen (For
. The anatomy of the domestic animals. Veterinary anatomy. Pig. 3.—Ckoss-section of Distal Third of Shaft O! Left Humerus of Horse. Section passea through nutrient foramen and canal. innumerable small branches which enter minute openings (Volkmann's canals) on the surface and reach the Haversian canals of the compact substance. Other branches enter the extremities of the long bones and supply the spongy bone and marrow in them. In the case of the larger bones—and especially the long bones— the large nutrient or medullary artery (Arteria nutricia) enters at the so-called nu- trient foramen (Foramen nutricium), passes in a canal (Canalis nutricius) through the compact substance, and ramifies in the marrow; its branches anastomose with the central branches of the periosteal set. The larger veins of the spongy bone do not, as a rule, accompany the arteries, but emerge chiefly near the articular surfaces. Within the bone they are destitute of valves. The l5rmph-vessels exist as peri- vascular channels in the periosteum and the Haversian canals of the compact sub- stance. They also form a fine subperiosteal network, from which the larger vessels proceed, usually in company with veins. Lymph-spaces exist at the periphery of the marrow. The nerves appear to be distributed chiefly to the blood-vessels. Special nerve- ' Since yellow marrow is formed by regressive changes in red marrow, including fatty infiltra- tion and degeneration of the characteristic cells, we find transitional forms or stages in the process. In aged or badly nourished subjects the marrow may undergo gelatinous degeneration, resulting in the formation of gelatinous Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Sisson, Septimus, 1865-1924. Philadelphia, London, W. B. Saunders Company
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