just the 3 O'Clock and 5 O'clock positions.

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Note added at 14 mins (2017-02-16 03:19:18 GMT)
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Anal Canal Anatomy: Gross Anatomy, Tissue, Nerves, and Muscles ...
emedicine.medscape.com/article/1990236-overview
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2016年6月29日 - The anal canal just above the pectinate line for about 1-2 cm is called the ... at 3-, 7-, and 11-o'clock positions in supine position) are prominent; they ... The anorectal junction or anorectal ring is situated about 5 cm from the anus. ... The middle rectal artery (a branch of the internal iliac artery) and the inferior ...

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Note added at 20 mins (2017-02-16 03:25:09 GMT)
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齿状线口侧=齿状线之肛门口一侧 = below the pectinate line


Hemorrhoids - Uchc
fitsweb.uchc.edu/student/selectives/Luzietti/Painful_anus_hemorrhoids.htm
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Hemorrhoids can be internal (originating above the dentate line), external (originating below the dentate line), or mixed. Internal hemorrhoids (also known as ...
Chapter 36: The rectum and anal canal
www.dartmouth.edu/~humananatomy/part_6/chapter_36.html
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In the upper third of the rectum, its front and sides are covered by peritoneum; in its ... The anal canal is very sensitive below the pectinate line, so that external ...

the 3 O'Clock and 5 O'clock positions in supine position