This is a thin sheet-like muscle located on the side of the trunk. Its fibers cross diagonally upward and forward from the iliac crest, inserting on the lower ribs and the linea alba (a band of fibrous tissue running down the front of the abdomen).
Contraction of the internal oblique draws the opposite shoulder forward and bends the trunk laterally. This action accentuates twisting postures such as parivrtta trikonasana. Contracting the internal oblique also contributes to the "air bag" effect described for the rectus abdominus.
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