Using a Sonasite M-Turbo with a 5-2 MHz 60-mm broadband curved array at a depth of 5.6cm, Patient was placed in a Sims position for a sciatic block (R side up). External landmarks of the Greater Trochanter, posterior superior iliac spine, and sacral hiatus were ID'd/drawn in the typical fashion as if utilizing a nerve stim. Transducer was placed on a parallel line draw between the GT and SH @ 4 cm midpoint below line drawn from GT and PSIS.

Identify the structures below.