Inner cell mass forms two cavities:
{"Image DocumentName": "Inner cell mass forms two cavities:", "Image ImageDescription": "The yolk sac. Amniotic cavity. In humans the yolk sac produces blood cells and future sex cells. The amniotic cavity becomes the cavity in which the embryo floats. Fluid is produced from fetal urine, and secretions from the skin, respiratory tract, and amniotic membranes.", "Image XResolution": "37", "Image YResolution": "37", "Image ResolutionUnit": "Pixels/Centimeter", "Image Software": "SlidePlayer", "Image YCbCrPositioning": "Centered"}