Figure 45-11 Lumbar plexus nerve blocks: specific femoral nerve block (A), fascia iliaca compartment block (B), and "3-in-1" bloc (C), indicating the psoas muscle (1), lateral cutaneous nerve of the thigh (2), fascia iliaca (3), femoral nerve (4), femoral vessel sheath (5), fascia lata (6), division branches of the obturator nerve (7), femoral cutaneous posterior muscle (8), and sciatic nerve (9).