MSFinals-3306
A 27-year-old woman is in the second stage of labour. The fetal head is not descending, and the obstetrician decides to perform a ventouse extraction. He injects local anaesthetic into a nerve that crosses the ischial spine. This nerve then passes along the lateral wall of the ischiorectal fossa embedded in the obturator internus fascia in Alcock’s canal.
Which of the following is this nerve?