Figure 6.

Position of the US transducer and needle for the femoris approach to the ScN in experimental cats (a). Local anaesthetic (*) solution is surrounding the ScN (arrow head) showing the characteristic ‘doughnut’ sign. Tip of the needle (*) (b). Longitudinal US image showing the spread of local anaesthetic (*) along the ScN (arrow head) (c). Loss of proprioception after the injection (d).TM = trochanter major of the os femoris, LCF = condylus lateralis of os femoris, Fm = os femoris, Bfm = biceps femoris muscle, Lat = lateral, Med = medial, Cr = cranial, Cd = caudal, Prox = proximal, Dis = distal