Posterior superior iliac spine Ureter Great sciatic notch Vas deferens; Spine of ischium Vas deferens Seminal vesicle Bladder wall Levator ani Prostate 9, ?
The first is generally composed of three nerves, the hindmost of which, the furcalis, issues in most birds between the last two lumbo-sacral vertebrae, and then divides, one half going to the crural, the other to the sciatic portions.
It affects the great sciatic nerve which emerges from the pelvis and runs down the leg to the foot.
This large nerve exits the pelvis through the greater sciatic foramen to enter the gluteal region - more info.
The sciatic nerve is most likely to lie slightly medial to the path of the needle if these landmarks are used.