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I. Orientation of Pelvis |
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WebLecture Slide 31 |
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The iliococcygeus muscle is that part of levator ani that takes it's origin from the band of fused fascia known as the tendinous arch (arcus tendinous) and from the ischial spine. This muscle extends posteromedially to insert on the final segments of the coccyx. The three named muscles form the levator ani and make up the pelvic floor. Remember that although our pictures show a hole between right and left muscle of levator ani anterior to the rectum, this is not reflective of the anatomy of the pelvic floor, but a reminer that the structures here will vary according to the sex of the individual. All muscles join their contralateral counterpart along the midline and decussate with fibers surrounding the pelvic effluents. The muscles of levator ani are innervated by the pudendal nerve and by independent branches of sacral nerves 2 and 3. |
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