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  Indian J Med Microbiol
 

Figure 5: This figure shows the relevant anatomy of the posterior approach to the pudendal nerve. Alcock canal is depicted with cyan color on the internal surface of the obturator internus (yellow asterisk), anterior to the sacrotuberous ligament (blue asterisk) in the ischioanal fossa between the obturator internus laterally, and the levator ani (magenta asterisk) and iliococcygeus (white asterisk) muscles medially. The Alcock canal contains the pudendal nerve (yellow) and the internal pudendal artery and vein (red and blue). The pudendal nerve and vessels wind around the sacrospinous ligament (green asterisk) that connects the ischial spine with the lateral margin of the sacrococcyx. At the level of the sacrospinous ligament, the pudendal nerve runs in close proximity to the inferior gluteal artery and vein (green arrow), the sacral plexus and the sciatic nerve (black asterisk). The figure shows the footprint of the US transducer (blue frame) across the posterior margin of the ischial tuberosity visualizing the pudendal nerve near the proximal end of the Alcock canal

Figure 5: This figure shows the relevant anatomy of the posterior approach to the pudendal nerve. Alcock canal is depicted with cyan color on the internal surface of the obturator internus (yellow asterisk), anterior to the sacrotuberous ligament (blue asterisk) in the ischioanal fossa between the obturator internus laterally, and the levator ani (magenta asterisk) and iliococcygeus (white asterisk) muscles medially. The Alcock canal contains the pudendal nerve (yellow) and the internal pudendal artery and vein (red and blue). The pudendal nerve and vessels wind around the sacrospinous ligament (green asterisk) that connects the ischial spine with the lateral margin of the sacrococcyx. At the level of the sacrospinous ligament, the pudendal nerve runs in close proximity to the inferior gluteal artery and vein (green arrow), the sacral plexus and the sciatic nerve (black asterisk). The figure shows the footprint of the US transducer (blue frame) across the posterior margin of the ischial tuberosity visualizing the pudendal nerve near the proximal end of the Alcock canal