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Fig. 3b. Lateral view of head of injected chick embryo of 15 somites, showing primary head capillary plexus. The plexus takes origin from the convexity of the first aortic arch at several points and is continued posteriorly as a slender capillary chain which eventually joins the main vitelline vein near its junction with the heart. This slender capillary chain has arisen at several points from the dorsal aorta on each side, and two of these points of origin are still preserved, opposite the region of the hind brain. The delicate capillary path from the head plexus to the vitelline vein is destined to form the anterior cardinal vein.

Fig. 4. Lateral view of head of injected chick embryo of 17 somites. showing the primary head capillary plexus partially covering the lateral sides of the fore and mid-brain vesicles. It will be seen that a‘ portion of the plexus lies more superficially than the remainder, and it is this superficial portion which is destined to become the main trunk of the vein in this region. The artery is shown darker than the vein.

Fig. 5. Lateral view of head of injected chick embryo of 20 omites. showing the further development of the anterior cardinal vein out of the primary head capillary plexus. The capillaries bordering the groove between mid and bind brain have formed a prominent tributary of the main vein.

Fig. 6. Lateral view of head of injected chick embryo of 25 somites. The lateral surfaces of the fore and mid brain vesicles are now completely covered by the capillary net, which is extending dorsally but is still far from the middorsal line. There is seen a corresponding great growth of the anterior cardinal vein and its system of tributaries.

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