Sacrospinous Ligament

Description

Positioned in the deep posterior pelvis, the right sacrospinous ligament spans from the lateral margin of the sacrum and coccyx to the ischial spine, running anterolaterally to form a firm band across the lesser sciatic notch. Anterior to it, the pelvic cavity opens toward the obturator foramen and acetabulum of the right os coxae, while posteriorly the broader sacrotuberous ligament lies superficial, extending toward the ischial tuberosity. Superiorly, the lower lumbar vertebrae transition into the sacrum at the lumbosacral junction, and inferiorly the proximal femur articulates at the hip joint, giving an immediate sense of how closely pelvic ligaments relate to load transfer from spine to lower limb. This is a tight neighborhood. Bony landmarks such as the ischial spine, greater sciatic notch, and lesser sciatic notch read clearly in relation to the ligament’s course. Sacrospinous and sacrotuberous ligaments convert the greater and lesser sciatic notches into foramina, shaping the routes of the pudendal nerve and internal pudendal vessels as they exit the pelvis via the greater sciatic foramen and re-enter through the lesser sciatic foramen adjacent to the ischial spine. That relationship matters in sacrospinous ligament fixation for apical prolapse, where sutures placed near the ischial spine risk pudendal neurovascular injury and postoperative buttock pain, and in regional anesthesia, where the pudendal nerve block targets the nerve as it crosses the ligament near the spine. You can teach that safely only when the depth relationship is clear. Designed for pelvic anatomy and pelvic floor surgery teaching, this artwork fits gross anatomy courses, urogynecology texts, and operative planning materials that need reliable depiction of the posterior pelvic ligament complex and its landmarks on the male hemipelvis. Anatomical accuracy verified by SciePro's Medical Advisory Board.