Answer :
Muscles and bones are derived from the mesoderm.
What is mesoderm?
In the very early stages of the formation of the embryo of most animals, gastrulation is when the mesoderm, the middle layer of the three germ layers, develops. Ectoderm is the uppermost layer, and endoderm is the lowest layer.
Coelomocytes, non-epithelial blood cells, mesothelium, mesenchyme, and mesoderm are all produced by the mesoderm. Mesothelium outlines coeloms. Myogenesis is the process through which mesoderm creates the muscles. Mesoderm also contributes to the development of the gonads and develops the septa and mesenteries (length-wise partitions) (the rest being the gametes). Particularly, mesenchyme has a role in myogenesis.
After the mesoderm separates from the rest of the embryo through intercellular signaling, an organizing center polarizes the mesoderm.
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