The lumbar plexus is fashioned lateral to the intervertebral foramina from the ventral rami of the primary 4 lumbar spinal nerves (L1-L4), which all go through psoas important. The larger sized branches with the plexus exit the muscle to move sharply downward to reach the abdominal wall and the thigh https://www.sgvascularctr.com/swelling-leg-treatment-singapore/