Document Detail


Morphology and ultrastructure of the chorioallantoic placenta of the Iberian mole (Talpa occidentalis) with special reference to heterophagous areolas and the nature of interhaemal barrier.
MedLine Citation:
PMID:  22703538     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
This study provides a contribution to the reconstruction of the eulipotyphlan placental morphotype and also may help resolving a long-standing conflict about the interhaemal barrier in moles. As detailed descriptions of talpid placentation, only available for Talpa europaea and Scalopus aquaticus, led to a controversial debate on the nature of interhaemal barrier, the collection of more placental data of further mole species was strongly desired. Hence, the placentas of six gestational stages of Talpa occidentalis have been studied concerning their morphogenesis and ultrastructure with special focus on the structure of the interhaemal barrier and heterophagous regions. Generally, the mode of placentation in T. occidentalis resembles that of T. europaea, including a broad, discoid, antimesometrial, definitive chorioallantoic placenta of labyrinthine type being still villous in earlier stages. Within the labyrinth, the zona intima shows an endotheliochorial interhaemal barrier with a two-layered trophoblast. This clearly contradicts former statements on the S. aquaticus placenta made by Prasad et al. (1979), although their findings cannot exclude a totally different interpretation. Regardless, the placenta of moles represents the least invasive mode of placentation among Eulipotyphla, which otherwise have highly invasive placentas. Although the phagocytic areolas situated above uterine gland openings are heterophagous, they mainly seem to serve fetal histiotrophic nutrition, at least early in pregnancy. In later stages the number of glands and areolas decreases. This special type of additional phagocytic region is usually most common in species with noninvasive, epitheliochorial placentation, which suggests a correlation between placental invasiveness and the occurrence and type of phagocytic placental structures. The compact and invasive mode of placentation of Talpidae and all other Eulipotyphla seems to be plesiomorphic within Laurasiatheria and is always correlated with an altricial neonate.
Authors:
Swetlana Siniza; Dario G Lupiañez; Rafael Jiménez; Ulrich Zeller
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2012-06-17
Journal Detail:
Title:  Journal of anatomy     Volume:  221     ISSN:  1469-7580     ISO Abbreviation:  J. Anat.     Publication Date:  2012 Aug 
Date Detail:
Created Date:  2012-07-03     Completed Date:  2012-09-24     Revised Date:  2014-08-10    
Medline Journal Info:
Nlm Unique ID:  0137162     Medline TA:  J Anat     Country:  England    
Other Details:
Languages:  eng     Pagination:  164-73     Citation Subset:  IM    
Copyright Information:
© 2012 The Authors. Journal of Anatomy © 2012 Anatomical Society.
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MeSH Terms
Descriptor/Qualifier:
Animals
Capillaries / ultrastructure
Chorioallantoic Membrane / anatomy & histology*
Female
Microscopy, Electron, Transmission
Moles / anatomy & histology*
Placenta / anatomy & histology*,  blood supply
Placentation
Pregnancy
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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