G.E.P. Atlas of anatomy

 

Figure 21: 

Triple loop of the anal striated sphincter (Shafik)

 

 

 
  1. Top loop: pubo-rectalis muscle
  2. Intermediate loop
  3. Fibrous core of the perineum
  4. Anal canal
  5. Base loop
  6. Ano-coccygeus ligament
  7. Coccyx
  8. Levator plate
  9. Rectum