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Placenta - Anatomy & Physiology (view source)
Revision as of 11:46, 12 July 2011
, 11:46, 12 July 2011→Formation
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Blood begins to circulate through the embryonic and cardiovascular system and therefore into the placenta at approximately 21 days (although there is some variance across species).
Blood begins to circulate through the embryonic and cardiovascular system and therefore into the placenta at approximately 21 days (although there is some variance across species). Seperation of the maternal and fetal blood is referred to as the "placental barrier". The placental barrier is made up of a number of layers;
* Syncytiotrophoblast
* Discontinuous inner cytotrophoblast layer
* Basal lamina of the trophoblast
* Connective (mesenchymal) tissue of the villus
* Basal lamina of the endothelium
* Endothelium of the fetal placental capillary in the teriary villus
==Types of Placenta==
==Types of Placenta==