During the period of the embryo, the muscles, circulatory system, and bones develop from the

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During the period of the embryo, the mesoderm, which is the middle layer of the embryonic disk, gives rise to the muscles, circulatory system, and bones. The endoderm gives rise to the digestive and respiratory systems, and the ectoderm gives rise to the skin and nervous system. The placenta is an organ that connects the embryo to the mother and provides nutrients and oxygen, but it does not develop into muscles, circulatory system, or bones.

During the Period of the Embryo, the Muscles, Circulatory System