Embryonic Development After fertilization, embryonic development progresses thro

Question

Embryonic Development

After fertilization, embryonic development progresses through three stages:

1. cleavage, during which the zygote develops into a blastula through extensive cell division;

2. gastrulation, during which three tissue layers are established by the dramatic rearrangement of cells, forming a gastrula;

3. organogenesis, during which the rudiments of organs develop.

The details of embryonic development vary by species, but the developmental sequence is consistent. Embryonic development has been studied extensively in a few species, including sea urchins, frogs, and chickens. All the images in this tutorial are based on frog development.

Explanation / Answer

Embryonic germ layers form.

Gastrula.

Neural tube

Somites.

Note:

Cleavage gastrulation organogenesis Cytoplasm portioned into many cells. Blastopore organs begin to develop from germ layers. Blastula.

Embryonic germ layers form.

Gastrula.

Neural tube

Somites.

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