Abdominal muscles of the cat. The external abdominal oblique m. (1) has been reflected ventrally and the internal abdominal oblique m. (2) is reflected dorsally, exposing the transversus abdominis m. (3) which originates from thoracolumbar deep fascia and from the costal arch (arrow). The transversus abdominis m. inserts on the linea alba via an aponeurosis that passes deep to the rectus abdominis m. (4). Ventral branches (asterisks) of lumbar spinal nerves run on the surface of the transversus abdominis m.

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