Análise ultra estrutural das membranas embrionárias e fetais de equinos

Abstract

To develop this research, 13 pregnant uteri were used, of which 13 placentas were obtained divided into groups at different stages of development. The material was taken from adult, mixed breed mares and at different gestation periods of up to 120 days and was destined for ultrastructural analysis. The results obtained from SEM (scanning electron microscopy) were similar to those found by ASSIS-NETO (2005), in bovine membranes. The allantoic showed cells whose surface was bordered by microvilli, forming polyhedral images, protruding “button” shaped structures were also observed. At the amnion, a surface similar to that of the allantois was observed, with its entire length covered by microvilli. In the corium, the apical surface of the cells are rounded and covered by microvilli. The yolk sac showed droplets of secretion at the apex of the cells indicating exocytosis. So far it has been concluded that the mare's placenta is chorioallantoic, epithelial, diffuse, non-deciduous and villous.