Your Inner Fish


Neil Shubin

Teachers and parents! Our Teacher Edition on Your Inner Fish makes teaching easy.
The small ball of cells that is the embryo from the first couple days after conception to about three weeks after conception. The blastocyst attaches to the uterus wall of the embryo’s mother, then begins to develop into the three germ layers that will form the entire body of the animal.
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Blastocyst Term Timeline in Your Inner Fish

The timeline below shows where the term Blastocyst appears in Your Inner Fish. The colored dots and icons indicate which themes are associated with that appearance.
Chapter 6: The Best-laid (Body) Plans
Understanding Complex Concepts Through Simple Analogies Theme Icon
...the first few days, the embryo is just a spherical clump of cells called a blastocyst. The blastocyst implants to the wall of the mother’s uterus and cells start to rapidly... (full context)
Understanding Complex Concepts Through Simple Analogies Theme Icon
Von Baer’s three germ layers are named for their position in the blastocyst. The ectoderm is the outer layer that forms the outside of the body (skin) and... (full context)