Development Of The Musculoskeletal System High Quality -

This segmentation explains the metameric (repeating) structure of the spine and intercostal muscles.

Skeletal muscle derives from the myotome. Myogenic precursor cells (myoblasts) express and Myf5 , fuse into multinucleated myotubes , and then mature into muscle fibers. development of the musculoskeletal system

Your bones don't start as hard calcium; they start as flexible . fuse into multinucleated myotubes