File:Hertwig1892 fig317.jpg

Fig. 317. Development of the large arterial trunks

Represented from embryos of a Lizard (A), the Chick (), and the Pig (C), after RATHKE.

The first two pairs of arterial arches have in all cases disappeared .

In A and B the third, fourth, and fifth pairs are still fully preserved ; in C only the two latter are still complete.

p, Pulmonary artery arising from the fifth arch, but still joined to the dorsal aorta by means of a ductus Botalli ; c, external, c', internal carotid ; aJ, dorsal aorta ; o, atrium ; r, ventricle ; n, nasal pit ; m, fundament of the anterior limb.

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The Development of the Blood-vessel System

Reference

Historic Textbook Text-Book of the Embryology of Man and Mammals by Dr Oscar Hertwig (1892)