. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. PACHYDERMATA. 863 some of the hog tribe, the two bones of the fore-arm are completely consolidated into one mass, the only vestiges of their having been originally distinct being the indication of a suture near the distal extremity of the fore-arm and a deep groove running along the middle third of the bone for the lodgement of the inter-osseous artery. In the Rhinoceros and Tapir, (Jigs. 475 Fig. Skeleton of American Tapir. and 476,) however, these bones remain perma- nently distinct, the elbow-joint being formed
. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. PACHYDERMATA. 863 some of the hog tribe, the two bones of the fore-arm are completely consolidated into one mass, the only vestiges of their having been originally distinct being the indication of a suture near the distal extremity of the fore-arm and a deep groove running along the middle third of the bone for the lodgement of the inter-osseous artery. In the Rhinoceros and Tapir, (Jigs. 475 Fig. Skeleton of American Tapir. and 476,) however, these bones remain perma- nently distinct, the elbow-joint being formed by the radius in front, which articulates with both condyles of the humerus and the ulna pos- teriorly, which completes the articulation. At their distal extremity the radius lies in front and to the inner side of the ulna, with which it is either anchylosed or immoveably connected by ligaments, both assisting to form the radio- carpal articulation. In the Elephant, the arrangement of these bones is very curious and perhaps unique: the upper head of the radius is firmly fixed between two projections in front of the head of the ulna, and assists in forming the elbow-joint articulating with the outer con- dyle of the humerus only. It then passes obliquely downwards across the anterior face of the ulna to its distal extremity, where it expands into a broad articulating surface, and assists almost coequally with the ulna in forming the carpal joint. Carpus.—The bones of the carpus are chiefly remarkable for their large dimensions; they are, however, always distinct and generally the same in number as in Man, although from their altered shape they little conform to the names bestowed upon them in the human sub- ject. The first row, consisting of the analogues of the scaphoid, the lunar, the cuneiform, and the pisiform bones, is firmly connected by liga- ments with the distal extremities of the ulna and radius to form the wrist-joint, which, how- ever, is here only capable of the
Size: 2121px × 1179px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bo, booksubjectanatomy, booksubjectphysiology, booksubjectzoology
