When the placenta separates from the uterine wall, blood vessels connecting the placenta to the endometrium (uterine lining) bleed. How much bleeding or how many other symptoms occur depends on ...

The vessels of the placenta are derived from the mesoderm. The implantation process occurs within 5–8 days of fertilization by attaching the blastocyst to an optimal location of the uterus.

Placental vessel occlusion was performed with a rigid 2.9 x 3.85 mm dual-channel fetoscope and neodymium:yttrium-aluminum-garnet laser light. RESULTS: Of the original 35 patients, 5 were ...

According to the NHS website TTTS affects 10 to 15% of identical twins who share a placenta, and it "can have serious consequences". The condition is caused by abnormal connecting blood vessels in ...