Gastrulation in the Pigeon's Egg- a Morphological And Experimental Study ..
Gastrulation in the Pigeon's Egg- a Morphological And Experimental Study ..
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In the case of birds, all of the mesoblast is derived from the primitive streak, that is, it is all peristomal mesoblast. In the bird, therefore, the tran- sition from a gastral to a peristomal mesoblastic formation has gone 9 step farther than in the case of the Amphibians. We have shown experimentally that as the gut-entoderm is being involuted, the con- crescence of the halves of the dorsal lip is also taking place. Further- more, there arises later from this fused region the primitive strea...k, or mesoblast. It is evident, therefore, that the invagination of the gut-entoderm and the primitive streak formation are but different parts of the same process, namely, that of gastrulation. The occur- rence of a short period (from shortly after the closing of the blasto- pore to the appearance of the primitive streak), during which one cannot distinguish, either by sections or by surface views, the primi- tive region, in no wise invalidates the above comparison.
Hertwig ('03) has divided the process of gastrulation in the amniota into two parts or phases.
What to read after Gastrulation in the Pigeon's Egg- a Morphological And Experimental Study ..?
You can find similar books in the "Read Also" column, or choose other free books by John Thomas Patterson to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
In the case of birds, all of the mesoblast is derived from the primitive streak, that is, it is all peristomal mesoblast. In the bird, therefore, the tran- sition from a gastral to a peristomal mesoblastic formation has gone 9 step farther than in the case of the Amphibians. We have shown experimentally that as the gut-entoderm is being involuted, the con- crescence of the halves of the dorsal lip is also taking place. Further- more, there arises later from this fused region the primitive strea...k, or mesoblast. It is evident, therefore, that the invagination of the gut-entoderm and the primitive streak formation are but different parts of the same process, namely, that of gastrulation. The occur- rence of a short period (from shortly after the closing of the blasto- pore to the appearance of the primitive streak), during which one cannot distinguish, either by sections or by surface views, the primi- tive region, in no wise invalidates the above comparison.
Hertwig ('03) has divided the process of gastrulation in the amniota into two parts or phases.
What to read after Gastrulation in the Pigeon's Egg- a Morphological And Experimental Study ..?
You can find similar books in the "Read Also" column, or choose other free books by John Thomas Patterson to read onlineMoreLess
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