Plasma bupivacaine concentrations (μg mL^-1) following femoral nerve blocks.

<p>Plasma bupivacaine concentrations (μg mL^-1) following femoral nerve blocks.</p

Ultrasound image of the iliopsoas muscle (IPM) in transverse section.

<p>The external iliac artery (EIA) is located medial to the IPM and the femoral nerve (FN) is identified as a round hypoechoic structure within the muscle.</p

Ultrasound image of the lateral aspect of the pelvic limb.

<p>The sciatic nerve (ScN) is located medial to the biceps femoris muscle and is identified as two ovoid hypoechoic structures with the cranial component (peroneal nerve) being smaller than the caudal component (tibial nerve) in transverse section.</p