TRANSPLANTATION OF LIMBS IN AMBLYSTOMA 



137 



The anterior elongation of the distal portions of the limb nerves 

 is seen in figure 16. It is interesting to note that the fourth 

 nerve did not unite with the third until the periphery had been 

 reached by an extended anterolateral growth. The ventral 

 ramus - of the second spinal nerve showed no connection with 



M TR BR 



ENT... 



14 15 



Fig. 14 Ventral view of case AA2S25. Limb transplanted into the gill region 

 as indicated in figure 3. Final position of limb, two and one-half body segments 

 anterior to normal level. Animal preserved fifty-one days after the operation. 

 X5. 



Fig. 15 Transverse section of right brachium of case AA2S25, at the level 

 A-A, figure 14, showing fusion of abnormal gill with radial side of the appendage. 

 X 58. No vascular elements have developed in the anomalous gill. H, humerus; 

 M TR BR, m. triceps brachii ; M COR BR LG., m. coracobrachialis longus ; M B BR, 

 m. biceps brachii; FNT, flexor nerve trunk; ENT, extensor nerve trunk; EG, 

 ectoderm of gill. 



that of the first, and its entire trunk was contributed to the plexus. 

 The hypoglossal nerve was formed solely of the first spinal nerve 

 which, after supplying branches to the somewhat reduced m. 

 sterriohyoideus, continued anteriorly to end in the m. genio- 

 hyoideus and the m. hyoglossus. 



