Dont be dense, there are fibrous intersections in the rectus abdominus that break it into pockets.
And there are 6 different abdominal muscle groups.
Its still one muscle cool guy. One long sheet of muscle. And he asked about a "six-pack" which is traditionally the rectus abdominis. I am aware there are several muscles in the abdomen. Be a little cooler and tell us about those 8 pairs, or 16 individual, muscles making up the abs. oke: