. The American journal of anatomy. ingly, first describe what I have found in theforms whicli 1 have studied, namely in the opossum, the cat, the mouseand man, and om]:)loy the tal)le contained in Windles paper only after Ihave established the probable line of differentiation. In a section through the upper part of the arm of an opossum (Fig. 5)the five portions of the flexor comiuunis are clearly recognizable, the con- 196 The Phylogeny of the Forearm Flexors dylo-iilnaris (C. U.);, lyi^J? beneath the medial head of the flexor carpiulnaris (F. C. XT) and the palmaris longiis (PL) and ventral
. The American journal of anatomy. ingly, first describe what I have found in theforms whicli 1 have studied, namely in the opossum, the cat, the mouseand man, and om]:)loy the tal)le contained in Windles paper only after Ihave established the probable line of differentiation. In a section through the upper part of the arm of an opossum (Fig. 5)the five portions of the flexor comiuunis are clearly recognizable, the con- 196 The Phylogeny of the Forearm Flexors dylo-iilnaris (C. U.);, lyi^J? beneath the medial head of the flexor carpiulnaris (F. C. XT) and the palmaris longiis (PL) and ventral to theiilnaris (Ul), the condylo-radialis {CJi) lying to the radial side of thepalmaris and the condylo-iilnaris, while between it and the radialis isthe slender centralis (C), Avhich corresponds to the slender little spindleof muscle, quite distinct from the rest, described by Cones (1872),whose identification of it with the flexor longus pollicis is manifestlyerroneous. Tracing the various portions down the arm, it is found that. Fig. 5. Transverse section through the forearm of the Opossum, ai, anteriorinterosseus nerve; C, centralis; CK, condylo-radialis; CU, condylo-ulnaris; F. , flexor carpi radialis; F. C. U. and F. C. U.^ lateral and medial portions of theflexor carpi ulnaris ; »i, median nerve ; PL, i^almaris longus; R, radius; Ra, radialis;U, ulna; u, ulnar nerve; UL, ulnaris. The shaded areas represent the flexor subli-mis digitorum. the condylo-ulnaris decreases in size rather rapidly, its fibres passing intoa flat tendon which lies on the surface of the muscle in contact with theulnaris, A portion of the muscle, represented approximately by the por-tion which is shaded in Fig. 5, may, however, be traced onward to thewrist where it passes into a tendon lying to the ulnar side of and super-ficial to the large tendon which is formed b}^ the fusion of the maincondylo-ulnar tendon with the other four portions of the flexor com-munis. Later the superficial condylo-u
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectanatomy, bookyear1901
