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Laboratory 35. Anterior Abdominal Wall
Step 16. Reflection of Internal Abdominal Oblique Muscle

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Make a longitudinal incision in the internal abdominal oblique muscle parallel to the incision made in the external abdominal oblique muscle.Begin separating the internal abdominal oblique muscle from the underlying transversus abdominis muscle , (Figure 35.7). Be careful when cutting through the muscle not to damage the thoracoabdominal nerves and vessels that also lie deep to it. Usually this procedure is more difficult than reflecting the external abdominal oblique muscle due to minimal amounts of connective tissue separating the internal abdominal oblique muscle from the underlying transversus abdominis muscle. The vessels and nerves are the key to identifying this plane.

Within the plane that separates the internal abdominal oblique muscle from the transversus abdominis muscle, detach the superior border of the internal abdominal oblique muscle from the costal margin. Reflect the internal oblique muscle towards the linea semilunaris .

Links and References:
Grant's: 2.6
Netter: 234
Rohen/Yokochi: 200, 203