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