. Key to North American birds [microform] : containing a concise account of every species of living and fossil bird at present known from the continent north of the Mexican and United States boundary, inclusive of Greenland. Birds; Ornithology; Oiseaux; Ornithologie. sti iiL'ti'ts, in adult life, of ten or ekrcn actually separate bones; iu the embryo (see fig. 29) there are indications of several nil ire at the wrist-joint, which speedily lose their individual identity by fusing together and with bones of the baud. Afiidc from these, there is often an accessory ossicle at Fro. 28. — Mechanism
. Key to North American birds [microform] : containing a concise account of every species of living and fossil bird at present known from the continent north of the Mexican and United States boundary, inclusive of Greenland. Birds; Ornithology; Oiseaux; Ornithologie. sti iiL'ti'ts, in adult life, of ten or ekrcn actually separate bones; iu the embryo (see fig. 29) there are indications of several nil ire at the wrist-joint, which speedily lose their individual identity by fusing together and with bones of the baud. Afiidc from these, there is often an accessory ossicle at Fro. 28. — Mechanism of elbow-Joint. (See explniintion of ilg. 27.) the shoulder-joint (tig. 56, ohs), .sometimes one at the wrist-joint, occasionally an extra bone at the end of the pruicipal finger. The normal or usual number is shown in fig. "27, taken from u duck (Clangula inlandica), in which there are eleven. The upper arm-bone, h, reaching from the shoulder A to tlie elbow B, is the humerus. In the closed wing, the linnKU'us lies nearly in the position of the sanu; bone in nuiii when the elbow is against the side of tlie body; in ( of the wing, the elbow is borne away from the body, as when wo raise the ann, but carry it neither forward nor backward. A peculiarity of the bird's humerus is, that it is njtated on its a.\is through about the quadrant of a circle, so that wliat is the front of the human bone is the outer aspect in the bird. The humerus is a cylindric bone, straightisli or some- what italic /-shaped, with a globular heatl to fit tlie socket of the shoulder, a strong pectoral ridge for insertion of the breast muscles, and at the bottom two condyles (fig. 28, re, uc,) or joint-surfaces for articulation M'ith a pair of succeed- ing bones. The fore-arm, cubit or antihrachium, extending from elbow to wrist, B to C, in fig. 27, has two parallel bones of about equal lengths. These are the ulna, ul, and the radius, rd; the former, inner and posterior, the larger of the t
Size: 1158px × 2158px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1880, booksubjectbirds, bookyear1884
