Which structure is passed by needle to reach the nerve in this block?

Ans. D. Sacrospinous ligamentPudendal Nerve Blocka. The pudendal nerve (S2-4) represents the primary source of sensory innervations for the lower vagina, vulva, and perineum. It also provides motor innervations to the perineal muscles and to the external and sphincterb. Effective in relieving second stage labor painc. Technique: transvaginal (more popular)d. A needle and needle guide is introduced into the vagina with the left hand for the left side of the pelvis and with the right hand for the right side. The needle is introduced through the vaginal mucosa and sacrospinous ligament, just medial and posterior to the ischial spine. The pudendal artery lies in close proximity to the pudendal nerve; thus, the one must aspirate before and during the injection of LA.