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Figs. 9-12.Chick Embryo 23, 24, 30, 35 Somites

Fig. 9. Injected chick embryo of 23 somites to show the origin of the umbilical vein from a capillary plexus situated in the angle between the posterior cardinal vein and the duct of Cuvier. A. C. V. = anterior cardinal vein; P. C. V. = posterlor cardinal vein; U = capiliaries destined to form the umbilical vein.

Fig. 10. Injected chick embryo of 24 somites to show the extension in the somatopleure, of capillary plexus forming the umbilical vein. The lettering is the same as fig. 9.

Fig. 11. Injected chick embryo of 30 somites. The capillaries destined to form the umbilical vein have reached the region of the future arm bud where they are joined by a direct capillary sprout from the aorta (subclavian artery).

Fig. 12. Injected chick embryo of 35 somites, showing establishment of umbilical vein as the main drainage channel of the anterior limb.

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