PMID: 1211098Jan 1, 1975Paper

Vascular anastomoses in twin placentae and their recognition

Acta Anatomica
I Bhargava, A Chakravarty

Abstract

166 placentae from multiple pregnancies (including three triplets and 17 monochorral) have been studied by injection corrosion technique, using cellulose acetate buterite in acetone, under continuous pressure within physiological limits. It has been shown that vascular anastomoses in twin placentae are usually multiple. The direct type is frequently found in monochorial twin placentae and is mostly arterial or venous in nature. The indirect type is observed more commonly in dichorial twin placentae and is mostly arteriovenous in nature. Both types are almost universally found in monochorial monoamniotic placentae. The presence of direct anastomotic channels has a highly significant association with the incidence of marginal vessels and an exaggeration of parameters of stress to an abnormal quantum--both singly and in combinations of three or more-, and is independent of the pattern of branching. In the ontogenetic time-sequence perspective, direct anastomoses, marginal vessels and parameters of stress in a twin placenta can be regarded as different phases of the sequelae of an altered vascular relationship caused by disturbances in the vicinity of the 12th week of gestation. It has been further shown that direct vascular anasto...Continue Reading

Citations

Mar 8, 2003·Journal of Clinical Microbiology·Liliana GabrielliMaria Paola Landini
Sep 23, 2003·International Journal of Gynecological Pathology : Official Journal of the International Society of Gynecological Pathologists·Maria P FoschiniMaria P Landini
Aug 1, 1982·The Canadian Journal of Neurological Sciences. Le Journal Canadien Des Sciences Neurologiques·M G Norman

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