Taenia coli
（重定向自Longitudinal bands）
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![Large bowel (sigmoid colon) with multiple diverticula. These appear on either side of the longitudinal muscle bundle (taenium).](/Images/godic/202501/24/Diverticula,_sigmoid_colon3843.jpg")
The teniae coli (also taeniae coli) are three separate longitudinal ribbons of smooth muscle on the outside of the ascending, transverse, descending and sigmoid colons. They are visible, and can be seen just below the serosa or fibrosa. There are 3 teniae coli: Mesocolic, Free and Omental Coli taenia . The teniae coli contract lengthwise to produce the haustra, the bulges in the colon.