. Contributions to embryology. Embryology. 474 ON THE ORIGIN AND EARLY DEVELOPMENT around the stumi) (fig. 10). The anterior portion of tliis plexus was entirely normal, as was also the i)osterior jwrtion, except for the absence of large channels over the posterior tip of the i)elvis and the presence in their place of a more primitive plexus with fine delicate endings. On the right side there was a very large gap which bordered dorsally on the spinal column and left the entire Wolffian body and most of the hver exposed. The lymphatic injection showed a normal plexus dorsal to the shoulder, con
. Contributions to embryology. Embryology. 474 ON THE ORIGIN AND EARLY DEVELOPMENT around the stumi) (fig. 10). The anterior portion of tliis plexus was entirely normal, as was also the i)osterior jwrtion, except for the absence of large channels over the posterior tip of the i)elvis and the presence in their place of a more primitive plexus with fine delicate endings. On the right side there was a very large gap which bordered dorsally on the spinal column and left the entire Wolffian body and most of the hver exposed. The lymphatic injection showed a normal plexus dorsal to the shoulder, connected anteriorly, as on the left side, with the deep cervical plexus, and posteriorly with the side Ij-mphatics. This ])lexus was not extensive, owing to the large size of the gaii. It connected anteriorly through the axilla with the deep jugular plexus, and posteriorly ended blindly in numerous fine points at the edge of the gap. On the anterior border of the pelvis (in the region just posterior to the gap), as in the younger chicks just described, no Ijinphatics were injected. Farther posteriorly on the pelvis, however, a large plexus of lymphatic capillaries was injected. This was normal in appearance and more extensive than that shown in fig. 9. It extended over the tip of the pelvis, ending, Uke the plexus of the opposite side, near the middle of the stump in numerous finely-pointed, bUnd tips (figs. 11 and 12). A still older stage is shown in figure 13, a cliick of 7 days. The lymphatics of the left side resembled those shown in figure 10, except for the presence of some larger ducts in the side region between the limbs. On the right side the lymphatics of the shoulder region, and of the side region anterior to the gap, were normal for chicks of tliis stage. Over the pelvis, from the region just posterior to the gap and extending well around the stump, was a luxuriant plexus of lymphatics resembling those of the opposite side in character and extent. No connections betwe
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Keywords: ., bookauthorcarn, bookpublisherwashingtondc, booksubjectembryology
