File:Sabin1915 plate07.jpg

Plate 7

Fig. 16. Injection of the veins in an embryo pig 28 mm. long to show the relation of the v. hemiazygos accessoria to the caudal part of the v. cardinalis sinistra which still persists at this stage. X17.

D. c., ductus Cuvier; v. A., v. azygos; v. c. A., v. cardinalis anterior; v. c. P., v. cardinalis posterior; v. HA., v. hemiazygos; v. HA. A., v. hemiazygos accessoria; v. o., oblique vein which is a branch of the v. azygos; \v u ., Wolffian body.

Fig. 17. Dissection of an embryo pig is mm. long in which the vascular system has been injected with India ink through the umbilical artery. The specimen shows the azygos and hemiazygos veins and their relation tn the disappearing vv. cardinales posteriores. X20.

v. A., v. azygos; v. c., common stem of the v. ulnaris primitiva and the v. thoraco-epigastrica; v. c. A., v. cardinalis anterior; v. c. P., v. cardinalis posterior; v. HA. A., v. hemiazygos accessoria; v. o., oblique vein which is a branch of the v. azygos; w. B., Wolffian body.

Fig. 18. Dissection of an embryo pig 40 mm. long in which the vascular system has been injected with India ink through the umbilical artery. View of the v. azygos and v. hemiazygos. X26.

v. A., v. azygos; v. HA., v. hemiazygos; v. HA. A., v. hemiazygos accessoria; v. o., oblique vein which is a branch of the v. azygos.

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