Transversus Abdominis

The Transversus Abdominis is associated with the entire costal margin and intercostal spaces 10 and 11. Its fibers above the ASIS run a transverse course and contribute to the posterior layer of the rectus sheath. Its fibers below the ASIS run an inferomedial course to the pubic crest. This represents the major contribution to the Falx Inguinalis.