Anatomy
·Abdomen
Posterior Abdominal Wall & Lumbar Plexus
⭐ PREMIUM
The posterior abdominal wall muscles (psoas, quadratus lumborum, iliacus) cradle the lumbar plexus, whose branches emerge in a testable pattern.
MUSCLES
• Psoas major (+ minor), quadratus lumborum, iliacus, transversus abdominis aponeurosis.
• The arcuate ligaments of the diaphragm arch over psoas (medial) and quadratus lumborum (lateral).
LUMBAR PLEXUS (T12–L4) — within psoas; mnemonic "I,…
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