The outermost flat abdominal muscle with fibres running inferomedially. Its lower edge forms the inguinal ligament between ASIS and pubic tubercle.
| 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 | Bilateral: trunk flexion and intra-abdominal pressure; Unilateral: same-side lateral flexion and contralateral rotation |
|---|
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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