File:Sabin1915 plate05.jpg

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Plate 5

Fig. 11. Dissection of an embryo pig 20 mm. long in which the vascular system has been injected with India ink through the umbilical vein. All of the viscera have been removed. X20.

A., aorta; v. A., v. azygos; v. B., common stem of the v. fibularis primitiva and the v. caudalis which becomes the lower segment of the vena cava; v. o. p., v. cardinalis posterior; v. L. T., v. lumbalis transversa; v. s. 2, v. spinalis of the second segment; v. TE., v. thoraco-epigastrica; v. u. P., v. ulnaris primitiva.

Fig. 12. Transverse section of an embryo pig 20 mm. long in which the vascular system has been injected with India ink through the umbilical artery. The section is to show the prevertebral plexus and passes through the median mesonephritic vein. The section is unstained and is 250 n thick. X77.

A., aorta; A. s., a. spinalis, which is now a branch of a single dorsal segmental artery; p. P., prevertebral plexus at the position of the future azygos vein, the limit of the development of the v. azygos for this stage being shown in fig. 11; p. p'., prevertebral plexus at the point in which the third segment of the inferior vena cava and the corresponding ascending lumbar vein develop at the level below the median mesonephritic vein; p. p. v., prevertebral plexus of small veins resting on the vertebra; v. M. M., v. mediana mesonephritica, the anastomosis across the mid-line of the embryo of the two vv. cardinalis mesiales; v. T. M., v. transversa mesialis of the Wolffian body.

Sabin 1915: plate 1 | plate 2 | plate 3 | plate 4 | plate 5 | plate 6 | plate 7 | pig

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Sabin FR. On the fate of the posterior cardinal veins and their relation to the development of the vena cava and azygos in the embryo pig. (1915) Pub. No. 223 Contrib. Embryol., Carnegie Inst. Wash. 3(7): 5-32. PDF

Cite this page: Hill, M.A. (2024, February 27) Embryology Sabin1915 plate05.jpg. Retrieved from

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