Transversus Abdominis Posterior Fascial Insertion

tendo posterior musculi transversi abdominis

The transversus abdominis muscle inserts posteriorly via the thoracolumbar fascia middle layer, contributing to the posterior abdominal wall through a complex fascial tendinous aponeurosis. This posterior insertion is the basis of the TAP (transversus abdominis plane) block zone.

Region: Abdomen

Clinical Relevance

Clinical Notes

The posterior transversus abdominis fascial insertion defines the TAP block target plane, where local anaesthetic is injected between the internal oblique and transversus abdominis layers to provide abdominal wall analgesia. The posterior fascia at the lateral edge of the muscle is the landmark for the lateral TAP approach. Component separation for complex hernia repair divides the external oblique while preserving the transversus aponeurosis.

Pathology

Common Injuries & Conditions

Posterior TAP Layer Disruption in Hernia Repair

Inadvertent division of the transversus abdominis posterior fascial insertion during hernia dissection weakening the posterior wall support and predisposing to recurrent hernia formation.