. The anatomy of the domestic animals. Veterinary anatomy. 124 THE SKELETON OF THE HORSE. difference is about two inches. The shaft is more cyhndrical, and is almost cir- cular on cross-section, except in its distal part. At the proximal part of its lateral surface there is a groove, which is directed obliquely downward and backward, and is continued by the furrow formed by the apposition of the fourth or lateral meta- tarsal bone; it indicates the course of the great metatarsal artery. A shallow im- pression in a similar place on the medial side marks the position of the corresponding vein. T
. The anatomy of the domestic animals. Veterinary anatomy. 124 THE SKELETON OF THE HORSE. difference is about two inches. The shaft is more cyhndrical, and is almost cir- cular on cross-section, except in its distal part. At the proximal part of its lateral surface there is a groove, which is directed obliquely downward and backward, and is continued by the furrow formed by the apposition of the fourth or lateral meta- tarsal bone; it indicates the course of the great metatarsal artery. A shallow im- pression in a similar place on the medial side marks the position of the corresponding vein. The nutrient foramen is rela- tively higher than on the metacar- pal bone. The proximal extremity is much wider from before back- ward than that of the metacarpal bone. Its articular surface is slightly concave, and is marked by a large central non-articular de- pression, continued outward by a deep notch. The greater part of the surface articulates with the third tarsal, but there is a lateral facet for the fourth, and usually a small facet postero-medially for the second tarsal bone. Posteriorly there are two pairs of facets for articulation with the small metatarsal bones. The front is crossed by a rough ridge for insertion, which becomes larger and turns downward on the lateral side behind the vascular groove. The distal extremity closely resembles that of the corresponding meta- carpal bone. In some cases the distal part of the shaft is bent backward somewhat. The distal articular surface extends a little higher behind than in the case of the metacarpal bone. The large meta- tarsal bone is even more strongly constructed than the metacarpal. The shell of compact sub- stance is very tliick in the middle of the shaft, especially in front and 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,
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Keywords: ., bookcentury1900, bookdecade1910, bookpublisherphiladelphialondon
