Pelvis, pelvic floor, and perineal anatomy

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SAMPLE QUESTION

During vaginal delivery, a local anesthetic is placed near the ischial spine beside the sacrospinous ligament. Pain from stretching the lower vagina and perineal skin is reduced, while painful uterine contractions continue.

Pelvis, pelvic floor, and perineal anatomy

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Which nerve is the intended target of this localized block?