<prompt> Most common site for anal fissure is3 O clock6 O clock2 O clock10 O clock  <response>: An anal fissure synonym: fissure-in-ano is a longitudinal split in the anoderm of the distal anal canal Fig. 69.24, which extends from the anal verge proximally towards, but not beyond, the dentate line.most common site for anal fissure is 6 O; clock Ref: Bailey Love;s Sho Practice of Surgery,E25,Page-1251 