Abdominal muscles of the cat. The external abdominal oblique m. (1) takes origin from thoracic ribs (arrows) and from thoracolumbar deep fascia (asterisks). It inserts on the linea alba via an aponeurosis (2) that covers the rectus abdominis m. Caudally, the aponeurosis (3) contacts the thigh. Notice that muscle fascicles of the external abdominal oblique m. are angled caudally (i.e., they run from craniodorsal to ventrocaudal).

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