Where is the anus at nine o'clock?

In order to record the nature, location and size of anorectal diseases in the form of pictures for reference in diagnosis and treatment, doctors designed a set of representation methods of anorectal diseases according to the anatomical characteristics of anorectal diseases, that is, anal clock position representation.

Anal clock position representation: Take the patient's anterior pudendum (ventral surface) as the clock 12 and coccyx (dorsal surface) as the clock 6: 00, divide the anus into 12, mark the position of the lesion at this point with corresponding representatives and draw it there. For example, there is a hemorrhoid at the right front 10- 1 1. This position is marked with hemorrhoids, so it is easy to find the nine o'clock position of the anus.