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The Morula and Blastocyst |
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Script: By 3 to 4 days after fertilization, the dividing cells of the embryo assume a spherical shape and the embryo is called a morula. By 4 to 5 days, a cavity forms within this ball of cells and the embryo is then called a blastocyst. The cells inside the blastocyst are called the inner cell mass and give rise to the head, body, and other structures vital to the developing human. | ||
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All ages referenced to fertilization, not last menstrual period.
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The Morula and Blastocyst
( 5 days) |
Amnion and Germ Layers
( 7 days) |
The Folding of the Embryo
( 3 weeks) |
The Heart in Action
( 4 weeks, 4 days) |
Hand Plates and Cartilage
( 5 weeks, 6 days) |
Hand Movement
( 6 weeks, 6 days) |
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