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Maternal placental and myometrial blood flow in the pregnant rabbit.

1. In anaesthetized rabbits 27-29 days pregnant (term is 31 days) uterine blood flow was measured in an extracorporeal loop between a carotid and the central end of an external iliac artery, the descending aorta and its other branches being tied. Mean flow was 45 +/- 2 ml. min(-1), or 105 +/- 4 ml. min(-1) per kg uterus and contents in thirty-four litters.2. The partition of uterine blood flow to placentas ( approximately 60%), myometrium ( approximately 27%) and vagina ( approximately 13%) as estimated by injection of isotopelabelled microspheres of 35 or 50 mu diameter, was similar in intact