Abdominal muscles of the cat. The external abdominal oblique m. (1) is reflected ventrally, exposing the internal abdominal oblique m. (2) which originates form the last ribs (arrow) and from thoracolumbar deep fascia (asterisks) and from the ilium (tuber coxae). The internal abdominal oblique m. inserts on the linea alba via an aponeurosis (elevated by a probe) that ensheathes the rectus abdominis m. (3). Notice that muscle fascicles of the internal abdominal oblique m. are angled cranially (i.e., they run from caudodorsal to ventrocranial).

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