Short Description

Photo of man standing on rock at entrance to cave near shore

Short Description

Photo: Person mixing cereal, milk and strawberry jam, in white ceramic bowl

Short Description

The morula (1) continues to undergo cell divisions. As it does, cells start to migrate into separate layers, and a cavity starts to develop inside the ball of cells. When cells have migrated into distinct layers, the organism is called a blastocyst (2)

Long Description

Further information about this "Blastulation" image is available at Wikipedia (Public Domain).

Short Description

Two layers of the ball shaped blastocyst. The outer layer is the trophoblast. Inside the blastocystcavity is the inner cell mass (embryoblast).

Long Description

• The blastocyst consists of an outer layer of cells called the trophoblast, a fluid-filled cavity, and an inner cell mass called the embryoblast.
• Further information about this "Blastocyst" image is available at Wikipedia (GNU Free Documentation License).