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I. Orientation of Pelvis 

II. Osteology 

III. Joints 

IV. Ligaments 

V. Pelvic Musculature 

VI. Perineum

 [WebLecture Slide 17 320x240 pixels]  
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WebLecture Slide 17
 
As stated previously, the sacrotuberous and sacrospinous ligaments cross in a modified "X" shape. The placement of the sacrospinous ligament closes off the osseous greater sciatic notch creating the greater sciatic foramen.  
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Quicktime Movie 17  
The relationship of the sacrotuberous ligament, sacrospinous ligament, greater sciatic notch, lesser sciatic notch, greater sciatic foramen and lesser sciatic foramen are key to understanding the anatomy of the pelvis and perineum. Viewing these structures in three dimensions from several views will help clarify their relationships. Note that the relationships are better viewed on a half pelvis as the cavity of the lesser pelvis is quite small and mostly obstructed by the acetabulum and ischium when viewed laterally. 
 
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