20. POPLITEAL NERVE BLOCK ANATOMY DVCIPM（20。）.pdfVIP

20. POPLITEAL NERVE BLOCK ANATOMY The sciatic nerve supplies motor innervation to INTRODUCTION The popliteal fossa is bordered laterally by the entire lower leg via the posterior tibial nerve, the biceps femoris muscle and medially by the superficial and deep peroneal nerves, and the sural The popliteal nerve block is a block of the sciatic semimembranosus muscle. It is the site where nerve. The sural nerve is sensory only. These major nerve in the popliteal fossa with the patient in the the sciatic nerve splits into its two major com- branches of the sciatic nerve also supply sensory prone position. The block is ideal for surgeries ponents, the tibial and common peroneal nerves innervation to the lower leg, except for the medial of the lower leg, particularly the foot and ankle. (Figure 20-1). To avoid an incomplete nerve inner strip, which is supplied by the saphenous It anesthetizes the same dermatomes as both the block, the needle entry site must be proximal to nerve (a branch of the femoral nerve). anterior and lateral approaches to the sciatic nerve the splitting of these two nerves (Figure 20-2). (Figure 18-1). Unlike more proximal approaches Studies have demonstrated that the needle to the sciatic nerve, the popliteal nerve block entry point should be 10 cm from the popliteal Teaching Points. Vascular puncture a