File:Jordan1918 fig04.jpg

Fig. 4. Section just below the point of bifurcation of the trachea

Section at approximately level a—a’ in figures 2 and 3 just below the point of bifurcation of the trachea. This is the point where the single-cell ‘angioblasts’ (hemoblasts) and the smaller cell-clusters (‘blood-islands’) begin to appear ventrally in both aortic roots. The section shows also the base of the right fore limb-bud, the right brachial plexus, the esophagus, the left ventricle, the bubus cordis, the inferior vena cava, the left duct of Cuvier, the liver with the ductus venosus dorsally, and the telencephalon with the right olfactory placode. The celom contains considerable blood at the right. Photo X 15. (In comparing the photograph of this section with fig. 2 the top should be turned to the right; with fig. 3, to the left.) (In the process of paraffin embedding the specimen changed its shape somewhat, chiefly through aceentuation of the several flexures, so that it no longer corresponds exactly with the form shown in the photographs 1 to 3, in consequence of which the level of sections cannot be indicated with absolute precision in the latter, nor any longer quite accurately with straight lines. Previous to embedding the embryo had been stained in tote with Delafield’s hematoxylin. It was sectioned at 10 microns.)

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Reference

Jordan HE. A study of a 7 mm human embryo; with special reference to its peculiar spirally twisted form, and its large aortic cell-clusters Volume 14, Issue 7, pages 479–492, July 1918

Cite this page: Hill, M.A. (2024, April 27) Embryology Jordan1918 fig04.jpg. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/File:Jordan1918_fig04.jpg

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