The transversus abdominis aponeurosis contributes to the posterior rectus sheath above the arcuate line and passes anteriorly below it. At the midline it fuses with the contralateral aponeurosis in the linea alba. Its deep surface is continuous with the transversalis fascia, which is the primary restraint against inguinal herniation.
Transversus abdominis plane (TAP) blocks target the fascial plane between the internal oblique and transversus abdominis aponeuroses, providing effective analgesia for abdominal wall surgery. Transversus abdominis activation is the foundation of core stability training in low back pain rehabilitation. The aponeurosis is thickened in the posterior abdominal wall as the anterior layer of the thoracolumbar fascia.
Muscular or aponeurotic disruption from sudden forceful expiratory effort producing acute lateral abdominal pain, confirmed by ultrasound demonstrating haematoma within the muscular layer.
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