High or low fistula is ano is termed according to its internal opening present with reference to
The anorectal ring marks the junction between the rectum and the anal canal. It is formed by the joining of the puborectalis muscle. the deep external sphincter, conjoined longitudinal muscle and the highest pa of the internal sphincter. The anorectal ring can be clearly felt digitally, especially on its posterior and lateral aspects. Ref: Bailey & Love&;s Sho Practice of Surgery,E25,Page-1240
Anal canal
Dentate line
Anorectal ring
Sacral promontary
G.I.T