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Microvascularization on collared peccary placenta: a microvascular cast study [corrected] in late pregnancy
Tatiana Carlesso Santos1, Moacir Franco Oliveira, Vibeke Dantzer
1Department of Animal Science, State University of Maringá, Paraná, Brazil. tcsantos@uem.br
Zoological Science
|July 11, 2012
Summary
The collared peccary placenta
Area of Science:
- Comparative anatomy
- Reproductive biology
- Vascular biology
Background:
- The placenta's microvasculature is crucial for nutrient and gas exchange.
- Understanding placental structure aids in comprehending reproductive strategies.
Purpose of the Study:
- To investigate the 3D microvascular organization of the collared peccary (Tayassu tajacu) placenta.
- To elucidate the vascular flow interrelation between maternal and fetal placental compartments.
Main Methods:
- Vascular casting to visualize 3D structure.
- Immunolocalization of α-smooth muscle actin and vimentin to identify cell types and vascular structures.
Main Results:
- Identified indented capillaries and complementary maternal/fetal microfolds (rugae).
- Maternal folds feature ridges with central arterioles and basket-like branching; venules form at the base.
- Fetal rugae show centrally branching arterioles forming bulbous capillary networks, with venules arising at the base.
Conclusions:
- Placental microvasculature suggests a countercurrent to crosscurrent blood flow pattern.
- Similarities in placental morphology between Tayassuidae and Suidae families highlight evolutionary conservation.
