The Journal of experimental zoology . 9 & Figs. 4 to 9 Normal embryos of A. punctatum, showing form and posture ofthe developing fore limb. Description in text. X 10. gate, the fourth being considerably behind the third in its de-velopment (fig. 9). Viewed from above, the arm at this time is EXPERIMENTS ON THE FORE LIMB OF AMBLYSTOMA 421 seen to be bowed toward the body. Further changes in theform of the Hmb are concerned largely with the lengthening ofthe various segments, notably the digits, and the more distinctdemarcation of the arm, fore arm, and manus. Rotation takes place at the shoulde
The Journal of experimental zoology . 9 & Figs. 4 to 9 Normal embryos of A. punctatum, showing form and posture ofthe developing fore limb. Description in text. X 10. gate, the fourth being considerably behind the third in its de-velopment (fig. 9). Viewed from above, the arm at this time is EXPERIMENTS ON THE FORE LIMB OF AMBLYSTOMA 421 seen to be bowed toward the body. Further changes in theform of the Hmb are concerned largely with the lengthening ofthe various segments, notably the digits, and the more distinctdemarcation of the arm, fore arm, and manus. Rotation takes place at the shoulder, the arm pointing morelaterally and ventrally, so that the tip of the first digit rests onthe bottom. Further rotation at this joint, coupled with flexionat the elbow, brings the manus much further forward beneaththe gills, and the animal now rests upon two digits of each balancers, which serve to support the larva on its belly,are not lost till this stage is reached. The first muscular move-ments take place at the sho
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Keywords: ., bookauthorwi, bookcentury1900, bookdecade1910, booksubjectzoology
