The authors explain that in a standard blow-hole colostomy, the omentum and seromuscular layers of the colon are sutured to the peritoneum and the rectus fascia.
The rectus abdominis at the level of xyphoid was supplied by a branch came from inferoir thorax artery, which diverged epigastric vessels at the same time.
In a big power-generating muscle like your rectus femoris in your quad, each of a thousand or so motor neurons may synapse with, and innervate, a thousand muscle fibers.