Abstract
By the use of the corrosion technique vascular communications between the fetal vascular beds were studied in 22 dichorionic diamniotic and 23 monochorionic diamniotic placentas. The following observations were made: 1. 1. Vascular anastomoses were demonstrated in 20 monochorionic diamniotic placentas. 2. 2. Not in all of these cases superficial arterio-arterial were present, nor did each placenta show deep arteriovenous anastomoses. 3. 3. None of the placentas contained more than three cotyledons shared by both twins. 4. 4. Six main types of vascular communications were found; these appeared in twelve different combinations. 5. 5. The vascular connection in shared cotyledons is by way of the villous capillaries and the paravascular capillary network. 6. 6. Evidence of the twin transfusion syndromes was present in three cases of twins with monochorionic diamniotic placentas.
Published Version
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