The lumbar plexus is shaped lateral towards the intervertebral foramina through the ventral rami of the 1st 4 lumbar spinal nerves (L1-L4), which all go through psoas major. The larger branches from the plexus exit the muscle to move sharply downward to get to the abdominal wall as well as https://www.sgvascularctr.com/swelling-leg-treatment-singapore/