The outermost flat abdominal muscle with fibres running inferomedially. Its lower edge forms the inguinal ligament between ASIS and pubic tubercle.
An expanded entry for External Oblique.
| Origin | Outer surfaces of ribs 5-12 via muscular digitations |
|---|---|
| Insertion | Anterior iliac crest, inguinal ligament, anterior rectus sheath, linea alba |
| Nerve Supply | Ventral rami of T5-T12 and iliohypogastric nerve (L1) |
| Blood Supply | Lower posterior intercostal arteries |
| Actions |
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|---|
Acting on one side it rotates the trunk to the opposite side and bends it sideways; acting together they flex the trunk and compress the abdomen.
The external oblique aponeurosis is the surgical landmark for inguinal hernia repair. The external ring is a split in the aponeurosis. In component separation, the external oblique aponeurosis is released to allow medial rectus advancement.
The lateral abdominal bulk, palpated during resisted contralateral trunk rotation.
Division of the external oblique aponeurosis allowing 5-10 cm of medial rectus advancement for large ventral hernia closure.
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