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I. Orientation of Pelvis

II. Osteology

III. Joints

IV. Ligaments

V. Pelvic Musculature

VI. Perineum

[WebLecture Slide 34 320x240 pixels]

WebLecture Slide 34

Almost any description of the pelvic diaphragm is clear when the structures are considered and drawn independent of the rest of the pelvic structures. However, the pelvis is a relatively small region that is filled with other muscles, arteries, nerves and pelvic viscera which make visualization in the laboratory extremely difficult. Also, the superior pelvic aperature can be extremely small adding to the difficulty of appreciating this view in the laboratory, especially when more than one student is trying to work in a space the size of the interior of a coconut!

This graphic shows the pelvic diaphragm with the piriformis and obturator muscles in place. The student should appreciate that the pelvic diaphragm serves as a separation between pelvis above and perineum below, but functionally as a support for the abdominal viscera. All of the abdominal viscera are resting on the pelvic diaphragm and need to be removed in order to visualize these structures from above.

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