Paper - A Human Embryo of Thirteen Somites

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Wallin IE. A Human Embryo of Thirteen Somites Am J Anat. 1913;

Historic Embryology Papers

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Pages where the terms "Historic Textbook" and "Historic Embryology" appear on this site, and sections within pages where this disclaimer appears, indicate that the content and scientific understanding are specific to the time of publication. This means that while some scientific descriptions are still accurate, the terminology and interpretation of the developmental mechanisms reflect the understanding at the time of original publication and those of the preceding periods, these terms and interpretations may not reflect our current scientific understanding.     (More? Embryology History | Historic Embryology Papers)

A Human Embryo Of Thirteen Somites

Ivan E. Wallin

Anatomical Laboratory, Bellevue Hospital Medical College, New York City

Seven Figures

The embryo which forms the basis of this work was given to me by Dr. Rudolph Boencke in the spring of 1911. It has been placed in the collection of the Department of Anatomy at the University and Bellevue Hospital Medical College and is called embryo no. 4.

The embryo was aborted two weeks after the last menstrual period. There was no record of coitus. After fixation and with the amnion intact the embryo measured 2.3 mm. in length. It was cut into transverse sections 5 u in thickness, and stained with iron‘ haematoxylin. The embryo yielded 287 sections.

Wax plate reconstructions were made of the complete embryo, the heart, the foregut, also of the caudal part of the medullary tube with the hind-gut and the belly stalk vessels. A graphic reconstruction was made representing the embryo cut in the mid-sagittal plane. All the reconstructions were made at a mag- nification of 200.

The embryo appears to be normal in every respect and the following points of structure have been determined.

External Form

In its general configuration this embryo is very similar to Pfannenstiel III described by Low (’08). The body has a regu- lar dorso-ventral curve and has a slight twist so that the head is situated to the right of the mid-sagittal plane. The yolk sac communicates with the primitive gut by means of an extensive yolk stalk. The latter has its greatest diameter in the cephalo~

Cite this page: Hill, M.A. (2019, August 22) Embryology Paper - A Human Embryo of Thirteen Somites. Retrieved from

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© Dr Mark Hill 2019, UNSW Embryology ISBN: 978 0 7334 2609 4 - UNSW CRICOS Provider Code No. 00098G