Pudendal Nerve Block Clinically important landmark: ischial spine a peripheral nerve block that provides local anesthesia over S2-S4 dermatomes that supply majority of perineum and over inferior quarter of vagina does not block pain from superior birth canal (uterine cervix and superior vagina) so that mother is able to feel uterine contractions injection is made where pudendal nerve crosses lateral aspect of sacrospinous ligament near its attachment to ischial spine Appendix Clinically important landmark: McBurney point base of appendix lies deep to a point called McBurney point that lies 1/3 of the way along the oblique line that joins the right anterior superior iliac spine (ASIS) and umbilicus Lumbar Puncture Clinically important landmark: iliac crest LP