The lumbar plexus is fashioned lateral to the intervertebral foramina with the ventral rami of the main 4 lumbar spinal nerves (L1-L4), which all pass through psoas key. The larger branches on the plexus exit the muscle mass to move sharply downward to get to the abdominal wall plus the https://www.sgvascularctr.com/swelling-leg-treatment-singapore/