Fig. 2. Transverse sonograms of the sciatic nerve showing the hyperechoic nerve ( arrowhead ) at the ischial spine level ( A ) (A = internal pudendal artery; GMM = gluteus maximus muscle; IB = ischial bone; IS = ischial spine; V = internal pudendal vein), the ischial tuberosity level ( B ) (GMM = gluteus maximus muscle; GT = greater trochanter; IT = ischial tuberosity), and the lesser trochanter level ( C ) (AMM = adductor magnus muscle; FA = femoral artery; LT = lesser trochanter).