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II. Osteology 

III. Joints 

IV. Ligaments 

V. Pelvic Musculature 

VI. Perineum

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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