The lateral cutaneous nerve of the thigh arises from the anterior divisions of the second and third lumbar nerves. It pierces the lateral border of the psoas major muscle. Then, it passes through the extra peritoneal fat obliquely across the iliacus muscle toward the anterior superior iliac spine. At this point, it passes under the inguinal ligament into the thigh. It then divides into an anterior and a posterior branch. The anterior branch continues downward in the fascia lata. It pierces it at about ten centimeters below the anterior superior iliac spine to supply the skin of the anterolateral aspect of the thigh as far as the knee. The posterior branch perforates the fascia lata and supplies the skin of the posterolateral part of the proximal half of the thigh.

Nervus cutaneus femoris lateralis

Nerf cutané latéral de la cuisse