The three layers (germ layers) are called ectoderm, mesoderm, and endoderm. (Biology.OpenStax.1755). The final stage is organogenesis (important stage) when the three germ layers of the gastrula develop various body organs (Biology.OpenStax.1756). During this stage, the brain, skin, and nervous system arises from the ectoderm, while the blood cells, heart, and muscle cells rise to the mesoderm. The digestive system, liver, and other internal organs give rise to the endoderm (Biology.OpenStax.1755). After this stage the embryo is called a fetus, and fetal development begins, in which several organs take their proper structure and positions the body to mature into a
The three layers (germ layers) are called ectoderm, mesoderm, and endoderm. (Biology.OpenStax.1755). The final stage is organogenesis (important stage) when the three germ layers of the gastrula develop various body organs (Biology.OpenStax.1756). During this stage, the brain, skin, and nervous system arises from the ectoderm, while the blood cells, heart, and muscle cells rise to the mesoderm. The digestive system, liver, and other internal organs give rise to the endoderm (Biology.OpenStax.1755). After this stage the embryo is called a fetus, and fetal development begins, in which several organs take their proper structure and positions the body to mature into a