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I. Orientation of Pelvis

II. Osteology

III. Joints

IV. Ligaments

V. Pelvic Musculature

VI. Perineum

[WebLecture Slide 16 320x240 pixels]

WebLecture Slide 16

This posterior view shows that, on each side, the sacrotuberous and sacrospinous ligaments cross in a modified "X". When viewed posteriorly, it is evident that the sacrotuberous ligament is the more exteriorly placed of the two ligaments, as the ischial tuberosity projects more posteriorly than the ischial spine with the pelvis in anatomical position. The sacrotuberous ligament crosses a longer interval making it relatively longer than the sacrospinous ligament. The blue structure peeking out from beneath the inferior border of the sacrotuberous ligament is the tendon of the long head of the biceps femoris which has two sites of attachment: one on the tendon, the other on the upper border of the ischial tuberosity.
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