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Figure 1.7
ssss1 Lateral view of abdomen of ox showing left abdominal oblique muscle. The external abdominal oblique has been removed.
Origin: Tuber coxae and lumbodorsal fascia.
Insertion: Linea alba (except for the most caudal part), last rib and cartilages of the caudal ribs.
Structure: This is a sheet of muscle and tendon with the fibres running cranioventrally. It is muscular at its origin and becomes tendinous ventrally. In the male a slip of the internal abdominal oblique muscle passes through the inguinal canal on the lateral aspect of the vaginal process and becomes the cremaster muscle (see Section 16.4).
Species variationsdogoxhorse
1.3.6 Transverse abdominal muscle (ssss1)
ssss1 Medial view of abdomen of ox showing the transverse abdominal muscle.
Origin: The medial surfaces of the ventral parts of the caudal ribs and the deep layers of the lumbodorsal fascia.
Insertion: The linea alba.
Structure: Again this muscle is sheet‐like, although its fibres run ventrally and transversely to the longitudinal axis. Caudally the muscle thins out to only a fascial layer.