[Craniofacial growth modified by blood supply. 3. Adaptation of the cranial arteries following unilateral ligation of the common carotid artery. Discussion of findings of the 1st and 2d communication].

Ligature of the right common carotid artery induces compensatory dilatation of the arteries of the head and neck, and particularly of the left common carotid artery. Functional mechanisms also caused dilatation of the arterioles. The enlargement of previously formed anastomoses and collaterals was also observed. Angiophysical effects and histochemical phenomena are implicated in the modification of previously existing anastomoses. The transport capacity of the collaterals increases as the area of the summated lumena increases and as the length of the vascular pathways decreases. The time factor, finally, also plays an important in role the formation of anastomoses, which continues even after an observation period of 12 months in the rat.