In vertebrates, the skeleton of different regions of the body arises from different precursor cells. Researchers at the ...

Skeletal muscle is joined to bones ... These are the biceps on the front of the upper arm and the triceps on the back of the upper arm. To raise the forearm, the biceps contract and the triceps ...

In vertebrates, the skeleton of different regions of the body ... which are produced on the back of the embryo and are developmentally closest to the cells of the central nervous system.