Assertion: amnion | /r/CapableOf | abut the placenta
Facets:
Source sentences:
text: a thin inter-twin membrane may be seen due to amnions abutting the placenta present: differentiating from an MCMA pregnancy but appears very thin without intervening chorion (often taken as <2 mm): differentiating from a DCDA pregnancy (although this assessment becomes increasingly difficult with the progression of pregnancy)