Rectus+abdominus

The rectus abdominus is shown as number 3 in this picture. It is a muscle which runs along the linea alba; the median line straight down the ventral belly of the cat. In the cats at school this muscle appears to have a thick layer of fascia (white colored connective tissue) running over it so you can clearly see where the dotted lines around this picture highlighting the rectus abdominus would be.