The middle flat abdominal muscle with fibres perpendicular to the external oblique. Its lowest fibres arch over the inguinal canal to form the conjoint tendon providing the posterior inguinal canal wall.
An expanded entry for Internal Oblique.
| Origin | Thoracolumbar fascia, anterior iliac crest, lateral inguinal ligament |
|---|---|
| Insertion | Lower 3-4 costal cartilages, linea alba, pubic crest via conjoint tendon |
| Nerve Supply | Ventral rami of T7-T12, iliohypogastric and ilioinguinal nerves (L1) |
| Blood Supply | Lower posterior intercostal arteries |
| Actions |
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|---|
Acting on one side it rotates the trunk to the same side and bends it sideways; acting together they flex the trunk and compress the abdomen.
The conjoint tendon weakness contributes to direct inguinal hernia. The ilioinguinal nerve runs between internal oblique and transversus and must be preserved in inguinal surgery. The TAP block targets the internal oblique-transversus plane.
The middle abdominal layer, palpable during resisted ipsilateral trunk rotation.
Conjoint tendon weakness allowing peritoneal protrusion through Hesselbach's triangle, repaired by mesh or suture reinforcement.
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