Sacrotuberous Ligament, Posterior View

Description

Posterior pelvic anatomy is centered on the sacrotuberous ligament, rendered as a stout fibrous band running from the lateral margins of the sacrum and coccyx inferolaterally to the ischial tuberosity. Superior to it lie the posterior ilium and posterior superior iliac spine region, while the ligament’s deep surface relates to the sacrospinous ligament as both define the greater and lesser sciatic foramina. Laterally, the proximal femur and greater trochanter frame the hip region, with the gluteus maximus and adjacent deep rotators positioned posterior to the hip joint and the hamstring origin near the ischial tuberosity. Orientation is clear. Functional interest in this ligament goes beyond pelvic stability: together with the sacrospinous ligament it converts the greater and lesser sciatic notches into foramina, shaping the corridor for the sciatic nerve, pudendal nerve, and internal pudendal vessels as they exit and re-enter the pelvis. Pain syndromes attributed to “deep gluteal” entrapment often hinge on appreciating where neurovascular structures traverse relative to the sacrotuberous ligament and the ischial spine. It also anchors portions of gluteus maximus and blends with the thoracolumbar fascia, which helps explain why altered load transfer at the sacroiliac joint can refer discomfort to the posterior thigh. Educators will find this posterior view effective for gross anatomy labs on the pelvis, teaching the boundaries of the sciatic foramina, and correlating ligamentous landmarks with posterior approaches to the hip and perineal blocks that use the ischial spine as a reference. Publishers can pair it with MRI or CT discussions of sacroiliac complex injury, postpartum pelvic girdle pain mechanisms, and hamstring origin pathology at the ischial tuberosity. Anatomical accuracy verified by SciePro's Medical Advisory Board.