an electron-microscopic study has shown that in placentae from prolonged pregnancies there is hyperplasia of the villous cytotrophoblastic cells , degeneration of occasional isolated cytotrophoblastic cells , a paucity of syncytial microvilli in some areas and microvillous proliferation in others , abnormalities of microvillous form , focal syncytial necrosis , dilatation of syncytial endoplasmic reticulum , decreased synctial pinocytic activity , a reduced size and number of syncytial mitochondira , thickening of the trophoblastic basement membrane and contraction , blebbing and vacuolation of endothelial cells of the stromal foetal villous capillaries .
C0014239
endoplasmic reticulum
C0007634
cells