This image shows a ventral view of the abdominal
wall of a cat, with the external oblique muscle reflected laterally. Note in
this image the prominent transversus abdominis, which originates from the
posterior ribs and the transverse processes of the lumbar vertebrae. The fibers
of this muscle extend ventrally and attach to the linea alba by an aponeurosis.
The rectus abdominis lies between the aponeuroses of the internal oblique and
the transversus abdominis for most of its length. Contraction of the rectus
abdominis compresses the abdomen and flexes the vertebral column.