The lumbar part of the lumbosacral plexus emerges from five spinal nerves: T12, L1, L2, L3 and L4

It gives origin to three important nerves in lower limb innervation: The femoral, the obturator and the lateral femoral cutaneous nerves

The most important lumbar plexus nerve concerning basic peripheral nerve blockade is the femoral nerve

It originates from the L2, L3, and L4 spinal nerves of the lumbar plexus

In the inguinal region the femoral nerve (FN) runs lateral to the femoral vessels and on top of the iliopsoas muscle

The femoral nerve runs below the iliacus fascia

To reach the nerve with your needle you have to penetrate two fascia: fascia lata and the iliacus fascia