Examlex
The cult of Asclepius used the symbol of the omphalos, two snakes entwining a winged rod, as the symbol of healing.
Embryonic Disk
The platelike inner part of the blastocyst that differentiates into the ectoderm, mesoderm, and endoderm of the embryo.
Blastocyst
A stage within the germinal period of prenatal development in which the zygote has the form of a sphere of cells surrounding a cavity of fluid.
Trophoblast
The outer part of the blastocyst from which the amniotic sac, placenta, and umbilical cord develop.
Placenta
An organ connected to the uterine wall and to the fetus by the umbilical cord. The placenta serves as a relay station between mother and fetus for the exchange of nutrients and wastes.
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