. Biology of the vertebrates : a comparative study of man and his animal allies. Vertebrates; Vertebrates -- Anatomy; Anatomy, Comparative. / NDigitI ^DigitH" Fig. 561. Fore-limb of an embryo tern, Sterna. (After Fig. 562. Flippers, a, sea turtle; b, whale; c, penguin. (After von Han- stein.) moves in only one plane but which by means of this specialization is rendered all the more efficient. The joints of the wrist and hand are mostly hinge joints, moving likewise in one plane, but the rotation of the radius around the ulna (Fig. 563) brings the hinge action of the hand into
. Biology of the vertebrates : a comparative study of man and his animal allies. Vertebrates; Vertebrates -- Anatomy; Anatomy, Comparative. / NDigitI ^DigitH" Fig. 561. Fore-limb of an embryo tern, Sterna. (After Fig. 562. Flippers, a, sea turtle; b, whale; c, penguin. (After von Han- stein.) moves in only one plane but which by means of this specialization is rendered all the more efficient. The joints of the wrist and hand are mostly hinge joints, moving likewise in one plane, but the rotation of the radius around the ulna (Fig. 563) brings the hinge action of the hand into any desirable plane. All of the small wrist bones are irregular, many-sided structures held together by ligaments and so playing upon each other as to allow consider- able motion. They fit together as a whole, forming a hollow trough with its convexity on the palmar side of the hand. Across this cavity the ligamentum carpi transversum stretches from side to side, and under the bridge thus formed the tendons, blood vessels, and nerves that supply the fingers go in safety. The articulations of the wrist bones, as well as the other bones of the arm, are shown diagrammatically by dotted lines in Figure 564. It will be seen from this diagram that the entire hand is hung upon the radius which is enlarged at the carpal end to receive it. Although the radius takes some part in the articulation of the forearm to the humerus at the elbow joint, this function is mainly accomplished by the ulna, which is consequently. 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 Walter, Herbert Eugene, b. 1867; Sayles, Leonard Perkins, 1902-. New York : Macmillan Co.
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Keywords: ., bookcentury1900, booksubjectanatomycomparative, booksubjectverte
