Transversus abdominis is the deepest of the three anterolateral abdominal wall muscles. It arises from a number of sites:
The fibres of transversus abdominis pass transversely around the abdominal wall deep to the internal oblique muscle. Anteriorly, they become aponeurotic.
The aponeurosis has two main insertions:
Transversus abdominis is innervated by the anterior primary rami of T7 to T12. The conjoint tendon is supplied by the ilioinguinal nerve (L1).
The actions of transversus abdominis are multiple:
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