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The ovoimplantation of Microcebus murinus Miller. (Primates, Lemoruoidea, Strepsirhini)
Abstract:
The process of nidation of Microcebus murinus may be subdivided into several stages (preadhesion, apposition, attachment and invasion), as is indicated for protracted phases of preimplantation. Not until the apposition stage does the inner cell mass orient itself orthomesometrially, while concurrently a nidation plaque develops in the abembryonal trophoblast that overlies and resorbs the coalescent glands. During the subsequent adhesion stage, the paraembryonal, bilaminar omphalochorion becomes attached to the uterine epithelium, with focal resorption of the latter. In addition, chorionic vesicles begin to develop. In the meantime, the embryonic disc has lost its trophoblastic cover as a preliminary to the formation of the pleuramnion. The formation of a nidation plaque, together with the subsequent central implantation of Microcebus, suggests a close relationship to Loris tardigradus, characterizing the mode of implantation of Strepsirhini. The nidation plaque and its invasive capacity, giving rise to a syndesmochorial placental nucleus, provide a placentological link to Galago demidovii.
Insights
The nidation process in Microcebus murinus involves distinct stages, including apposition and attachment, leading to early placental development. This study details the nidation plaque formation and its implications for primate reproductive biology.
Area of Science:
- Reproductive Biology
- Primate Embryology
- Developmental Biology
Background:
- The nidation process, crucial for mammalian reproduction, involves complex interactions between the embryo and the maternal uterus.
- Understanding nidation in primates provides insights into evolutionary reproductive strategies.
Purpose of the Study:
- To detail the stages of nidation in Microcebus murinus.
- To investigate the formation and role of the nidation plaque during implantation.
- To establish placentological links with other primate species.
Main Methods:
- Histological examination of Microcebus murinus implantation stages.
- Comparative analysis of nidation processes in Strepsirhini primates.
Main Results:
- Nidation in Microcebus murinus proceeds through distinct stages: preadhesion, apposition, attachment, and invasion.
- The apposition stage is characterized by inner cell mass orthomesometrial orientation and nidation plaque development.
- The adhesion stage involves omphalochorion attachment to the uterine epithelium and chorionic vesicle formation.
Conclusions:
- The nidation plaque formation and central implantation in Microcebus murinus indicate a close relationship with Loris tardigradus, characteristic of Strepsirhini implantation.
- The invasive capacity of the nidation plaque establishes a placentological link with Galago demidovii.