| A villus has a fibromuscular core with fetal blood vessels and is covered by an epithelium termed the trophoblast. |
| The blood-vessel network of the underlying allantois conveys nutrients that diffuse through the trophoblast to the body of the embryo proper. |
| The trophoblast eventually forms the placenta, through which the embryo proper receives dissolved nutrients and is cleansed of waste. |
| The surface of the sphere is made up of a layer of specialized cells called the trophoblast. |
| Dividing partitions, formed from the trophoblast shell, project into the intervillous space from the decidual side. |
| The trophoblast plays an important role later in the development of the placenta or afterbirth. |
