Lumbar Plexus

Sunday, December 4, 2011

The lumbar plexus is composed of the anterior branches of the lumbar nerves and fibers of the subcostal nerve. The lumbar plexus gives off direct short muscular branches to the hip muscles, namely, to the greater and lesser psoasmuscles (L1–L5), the lumbar quadrate muscle (T12–L3), and the lumbar intercostal muscles. The upper nerves of the plexus are still roughly organized in the same way as the intercostal nerves. Together with the subcostal nerve, they represent transitional nerves between the intercostal nerves and the lumbar nerves.