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Femoral nerve injury

The femoral nerve starts from the lumbar plexus and is composed of the anterior branches and posterior thighs of the lumbar 2, 3 and 4 nerves. It passes through the outer edge of the psoas major muscle, runs obliquely downward on the deep surface of the iliac fascia, reaches the femoral fascia sheath between the psoas major muscle and the iliac muscle, and sends out the iliac muscle branch and psoas major muscle branch in the iliac fossa. The trunk enters the femoral triangle through the deep surface of the inguinal ligament and the surface of the iliac psoas muscle, and is located outside the femoral artery. The femoral nerve passes 2 ~ 3cm behind the groin and divides into anterior branch and posterior branch. The anterior branch is divided into medial femoral cutaneous nerve and medial femoral cutaneous nerve, which innervate the anterior medial femoral skin and send out motor branches to innervate sartorius muscle and pubic muscle. The posterior branch first divides into muscle branches to match quadriceps femoris, and then a cutaneous nerve, namely saphenous nerve. The saphenous nerve enters the adductor tube with the femoral artery and vein from the femoral triangle, passes through the fascia from the lower end of the tube, is located behind the sartorius muscle at the knee, and then goes subcutaneously with the great saphenous vein to the medial malleolus.



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