Paper - The Development of the Infra-Umbilical Portion of the Abdominal Wall, with Remarks on the Aetiology of Ectopia Vesicae: Difference between revisions

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Wyburn GM. The Development of the Infra-Umbilical Portion of the Abdominal Wall, with Remarks on the Aetiology of Ectopia Vesicae. J Anat. 1937 Jan;71(Pt 2):201-31. PMID 17104636

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THE DEVELOPMENT OF THE INFRA-UMBILICAL PORTION OF THE ABDOMINAL WALL, WITH REMARKS ON THE AETIOLOGY OF ECTOPIA VESICAE

BY GEORGE M. WYBURN, M.B., CH.B., F.R.F.P.S.G. Senior Demonstrator of Anatomy in the University of Glasgow

The umbilical region of the human embryo has at all times attracted much interest as a proliﬁc source of congenital defects and abnormalities, in spite of which, perhaps because of which, there still exists some gaps in our knowledge regarding the method of closure and completion of the belly wall.

An examination of the sections of a human embryo of 4-5 mm. in length (McIntyre II), with a favourable history, and showing the yolk sac with con- necting duct, seemed to offer a fruitful ﬁeld for study. The impossibility of limiting observation to the umbilicus alone was soon apparent, and it became obvious that satisfactory results could only be procured by a more compre- hensive survey embracing the whole question of the development of the an- terior abdominal wall.

The initialkabsence of a ventral wall to the embryo is found in all verte- brates with the exception of some of the Amphibia.

In the frog with its small, yolked, holoblastic egg gastrulation is complete— the blastopore forms at the equator with dorsal, lateral and ventral lips and wholly encloses the yolk cells of the vegetative pole. The yolk is thus taken into the body of the embryo and lies in the ﬂoor of the gut.

In the Elasmobranchs the large amount of yolk impedes cell division so that segmentation is meroblastic. The resulting blastoderm corresponds to_,the cells of the animal pole of the frog’s egg. The embryo arises from the posteromedian portion of the blastoderm, so that only the dorsal lip of the blastopore is intra- embryonic, while the lateral and ventral lips, formed of the extra-embryonic

Cite this page: Hill, M.A. (2024, April 19) Embryology Paper - The Development of the Infra-Umbilical Portion of the Abdominal Wall, with Remarks on the Aetiology of Ectopia Vesicae. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/Paper_-_The_Development_of_the_Infra-Umbilical_Portion_of_the_Abdominal_Wall,_with_Remarks_on_the_Aetiology_of_Ectopia_Vesicae

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 {{Historic Disclaimer}}
+THE DEVELOPMENT OF THE INFRA-UMBILICAL
+PORTION OF THE ABDOMINAL WALL, WITH
+REMARKS ON THE AETIOLOGY OF
+ECTOPIA VESICAE
+BY GEORGE M. WYBURN, M.B., CH.B., F.R.F.P.S.G.
+Senior Demonstrator of Anatomy in the University of Glasgow
+The umbilical region of the human embryo has at all times attracted much
+interest as a proliﬁc source of congenital defects and abnormalities, in spite of
+which, perhaps because of which, there still exists some gaps in our knowledge
+regarding the method of closure and completion of the belly wall.
+An examination of the sections of a human embryo of 4-5 mm. in length
+(McIntyre II), with a favourable history, and showing the yolk sac with con-
+necting duct, seemed to offer a fruitful ﬁeld for study. The impossibility of
+limiting observation to the umbilicus alone was soon apparent, and it became
+obvious that satisfactory results could only be procured by a more compre-
+hensive survey embracing the whole question of the development of the an-
+terior abdominal wall.
+The initialkabsence of a ventral wall to the embryo is found in all verte-
+brates with the exception of some of the Amphibia.
+In the frog with its small, yolked, holoblastic egg gastrulation is complete—
+the blastopore forms at the equator with dorsal, lateral and ventral lips and
+wholly encloses the yolk cells of the vegetative pole. The yolk is thus taken into
+the body of the embryo and lies in the ﬂoor of the gut.
+In the Elasmobranchs the large amount of yolk impedes cell division so that
+segmentation is meroblastic. The resulting blastoderm corresponds to_,the cells
+of the animal pole of the frog’s egg. The embryo arises from the posteromedian
+portion of the blastoderm, so that only the dorsal lip of the blastopore is intra-
+embryonic, while the lateral and ventral lips, formed of the extra-embryonic