| Placentation in the Amazonian manatee (Trichechus inunguis). | |
| | |
MedLine Citation:
|
PMID: 18462617 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
|
Evidence from several sources supports a close phylogenetic relationship between elephants and sirenians. To explore whether this was reflected in similar placentation, we examined eight delivered placentae from the Amazonian manatee using light microscopy and immunohistochemistry. In addition, the fetal placental circulation was described by scanning electron microscopy of vessel casts. The manatee placenta was zonary and endotheliochorial, like that of the elephant. The interhaemal barrier comprised maternal endothelium, cytotrophoblasts and fetal endothelium. We found columnar trophoblast beneath the chorionic plate and lining lacunae in this region, but there was no trace in the term placenta of haemophagous activity. The gross anatomy of the cord and fetal membranes was consistent with previous descriptions and included a four-chambered allantoic sac, as also found in the elephant and other afrotherians. Connective tissue septae descended from the chorionic plate and carried blood vessels to the labyrinth, where they gave rise to a dense capillary network. This appeared to drain into shorter vessels near the chorionic plate. The maternal vasculature could not be examined in the same detail, but maternal capillaries ran rather straight and roughly parallel to the fetal ones. Overall, there is a close resemblance in placentation between the manatee and the elephant. |
| | |
Authors:
|
A M Carter; M A Miglino; C E Ambrosio; T C Santos; F C W Rosas; J A d'Affonseca Neto; S M Lazzarini; A F Carvalho; V M F da Silva |
Related Documents
:
|
19797017 - Expression of androgen receptor in human placentas from normal and preeclamptic pregnan... 3551067 - Ultrasound placental localisation in early pregnancy. 973237 - In vivo and in vitro studies of 15alpha-hydroxyprogesterone in the human placenta. 11312637 - Defect of syncytiotrophoblast formation and human chorionic gonadotropin expression in ... 4024877 - Screening in pregnancy with unconjugated estriol compared with total estriol. 11006157 - Control of ovarian follicular growth and maturation by the corpus luteum and the placen... |
Publication Detail:
|
Type: Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
|
Title: Reproduction, fertility, and development Volume: 20 ISSN: 1031-3613 ISO Abbreviation: Reprod. Fertil. Dev. Publication Date: 2008 |
Date Detail:
|
Created Date: 2008-05-08 Completed Date: 2008-08-07 Revised Date: - |
Medline Journal Info:
|
Nlm Unique ID: 8907465 Medline TA: Reprod Fertil Dev Country: Australia |
Other Details:
|
Languages: eng Pagination: 537-45 Citation Subset: IM |
Affiliation:
|
University of Southern Denmark, JB Winsloewsvej 21, DK 5000 Odense, Denmark. |
Export Citation:
|
APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
|
Animals Animals, Newborn Extraembryonic Membranes / anatomy & histology, blood supply Female Male Placenta / anatomy & histology, physiology, ultrastructure Placental Circulation / physiology Placentation / physiology* Pregnancy Pregnancy, Animal* Trichechus inunguis / physiology* Umbilical Cord / ultrastructure |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
Previous Document: Influence of nitric oxide during maturation on bovine oocyte meiosis and embryo development in vitro...
Next Document: Pregnancy following bilateral salpingectomy