Abstract
The maternal circulation of the hemochorial placenta common to man and the higher primates has been studied by serial and cineradioangiography. This technique has confirmed the validity of the circulatory hypothesis derived from previous anatomic and physiologic studies.1. Maternal blood enters the intervillous space from the endometrial spiral arterioles in discrete, relatively high-pressure, funnel-shaped streams.2. Inflow of blood is curtailed or abolished during uterine contractions.3. The endometrial spiral arterioles act independently of one another. Not all of them are patent and discharging blood into the intervillous space simultaneously.4. Several factors appear to be responsible for regulation of blood flow into the intervillous space: intrauterine pressure, the pattern of uterine contractility, the contour of the individual contraction wave, and those factors which act specifically upon arteriolar walls.5. Attention is called to the nonhomogeneity of the blood in the intervillous space.
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