. The comparative anatomy of the domesticated animals. Veterinary anatomy. TEE ANTERIOR LIMBS. 101 Arm. Fig. 62. This region has only one bone, the humerus. Humerus (Figs. 62, 63). The humerus is a long single bone, situated between the scapula and the bone of the forearm, in an oblique direction downwards and backwards. Like all the long bones, it offers for study a bodt/ and two extremities. Body.—The body of the humerus looks as if it had been twisted on itself from within to without in its superior extremity, and from without to within at the opposite end. It is irregularly prismatic, and
. The comparative anatomy of the domesticated animals. Veterinary anatomy. TEE ANTERIOR LIMBS. 101 Arm. Fig. 62. This region has only one bone, the humerus. Humerus (Figs. 62, 63). The humerus is a long single bone, situated between the scapula and the bone of the forearm, in an oblique direction downwards and backwards. Like all the long bones, it offers for study a bodt/ and two extremities. Body.—The body of the humerus looks as if it had been twisted on itself from within to without in its superior extremity, and from without to within at the opposite end. It is irregularly prismatic, and is divided into four faces. The anterior face (Fig. 62), wider above than below, has in its middle and inferior portions some muscular imprints. The pos- terior, smooth and rounded from one side to the other, "becomes insensibly confounded with the neighbouring faces. The external is excavated by a wide furrow, which entirely occupies it, and turns round the bone obliquely from above to below and behind to before ; it is to the presence of this channel that the humerus owes its ap- parent twist, and it is in consequence designated the/?/rrow of torsion (or inusculo-spiral groove) of the body of the humerus. This furrow is separated from the anterior face by a salient border—the deltoid ridge, which ends inferiorly above the coronoid fossa, and superiorly, towards the upper third of the bone, by the imprint, or deltoid (or external) tuberosity. This is a roughened, very prominent eminence, flattened before and behind, and inclining to- wards the furrow of torsion ; by its superior extremity, it gives origin to a curved line which is carried backwards to join the base of the articular head. Near the inferior extremity, backwards and outwards, is seen the posterior deltoid ridge, which separates the latter from the posterior face of the bone. The internal face of the body of the humerus, rounded from side to side, is not separated from the anterior and posterior faces by
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