Placenta
Videos
The placenta is a temporary embryonic and later fetal organ that begins developing from the blastocyst shortly after implantation. It plays critical roles in facilitating nutrient, gas, and waste exch
Human placenta from just after birth with the umbilical cord in place
Ultrasound image of human placenta and umbilical cord (color Doppler rendering) with central cord insertion and three umbilical vessels, at 20 weeks of pregnancy
Micrograph of a cytomegalovirus (CMV) infection of the placenta (CMV placentitis). The characteristic large nucleus of a CMV-infected cell is seen off-centre at the bottom-right of the image. H&E stain.
Human placenta immediately post birth.
Blastocyst
Videos
The blastocyst is a structure formed in the early embryonic development of mammals. It possesses an inner cell mass also known as the embryoblast which subsequently forms the embryo, and an outer laye
Early development of the human embryo from ovulation through implantation