The genitofemoral nerve arises from the anterior divisions of the first and second lumbar nerves by two roots which pass obliquely through the psoas major muscle and unite on the surface of the muscle to form a single nerve. The nerve runs downward in the extraperitoneal fat upon the psoas major muscle, and upon the lateral side of the external iliac vessels and above the inguinal ligament divides into a genital and a femoral branch. The genital branch accompanies the spermatic vessels through the inguinal canal and abdominal rings. Its branches pierce the internal spermatic fascia to supply muscular filaments to the cremaster muscle. It ends in the skin of the scrotum or labium majora. The femoral branch runs under the inguinal ligament and passes into the lateral compartment of the femoral sheath. It sends off filaments to the femoral artery. It then pierces the lateral side of the femoral sheath and passes through the fascia lata a little below the inguinal ligament and lateral to the femoral artery.

Nervus genitofemoralis

Nerf génito-fémoral