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I. Orientation of Pelvis  

II. Osteology  

III. Joints  

IV. Ligaments  

V. Pelvic Musculature  

VI. Perineum

[WebLecture Slide 30 320x240 pixels]
  
WebLecture Slide 30
  
The most posterior of these pelvic effluents is the rectum. The rectum is surrounded by bands of muscle called the puborectalis muscle. The paired puborectalis muscles originate from the pubis, just lateral to the symphysis and head posteriorly towards the rectum.  Fibers of the left and right puborectalis muscles pass posterior to the rectum and join muscle fibers of the contralateral side. The puborectalis joins the external anal sphincter and forms a sling around the rectum producing a flexure at the anal rectal junction.   
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