. Annals of the Carnegie Museum. Carnegie Museum; Carnegie Museum of Natural History; Natural history. Kic. 5. Distal ends of right radius and ulna in position, about one-tenth natural size. (No. 563.) Vu;. 6. Proximal end of right ra- dins and ulna in position, about one- tenth natural size. (No. 563). bisecting the rugosity. This groove doubtless served for the trans- mission of an artery. Opposed to this rugosity on the radius there is a similar one on the middle of the internal surface of the ulna near its distal extremity. These rugosities doubtless served for the attach- ment of the musc
. Annals of the Carnegie Museum. Carnegie Museum; Carnegie Museum of Natural History; Natural history. Kic. 5. Distal ends of right radius and ulna in position, about one-tenth natural size. (No. 563.) Vu;. 6. Proximal end of right ra- dins and ulna in position, about one- tenth natural size. (No. 563). bisecting the rugosity. This groove doubtless served for the trans- mission of an artery. Opposed to this rugosity on the radius there is a similar one on the middle of the internal surface of the ulna near its distal extremity. These rugosities doubtless served for the attach- ment of the muscles which held these bones in place. Seen from below, the articular sur- face of the distal end of the radius has the form of an elongated ellipse with an area somewhat that of the distal end of the ulna, which takes the form of an oblique quadrangle with its two axes nearly equal. There is on the internal surface of the distal end of the ulna a rather deep emargination or fossa for the re- ception of the rounded postero-external angle of the distal end of the radius. This emargi- nation appears, though less distinctly, on the internal border of the distal articular surface of the ulna, as shown in Fig. 5. Its presence affords great assistance in the proper adjust- ment of these bones, since when they are so placed that the convex siu-face of the proximal end of the radius fits nicely into the radial groove of the ulna and the ])ostero-external angle of the distal end of the radius in this fossa there can be no question as to the correct rela- tive positions of these bones. The articular surfaces of the distal ends ¥lG. 7. Posterior view of right radius, about one-tenth natural size. (No. 563.). 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 Carnegie Museum; Carnegie Museum of Natural History. [
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