... found that muscle bundle shapes and attachment sites were significantly altered in embryos with Scx -lineage cell ablation. Muscles in the forelimb showed impaired bundle separation and limb girdle muscles distally dislocated from their insertion sites. Scx -lineage cells were required for post-fusion...

... myotubes in embryonic rat muscles transmit tension during the period of their development. Primary myotubes extend from end to end of the muscle from the earliest times, and attach directly to the tendon. In contrast, newly formed secondary myotubes are short cells which insert solely into the primary...