Intersphincteric groove - Definition
It is a groove in the anal canal that makes up the bottom margin of the pecten analis. It separates the internal anal sphincter margin from the subcutaneous region of the external anal sphincter. The furrow is also referred to as “Hilton’s White Line,” after John Hilton, an eminent British surgeon.
Intersphincteric groove - Appearance
In humans, the groove appears white in color. This is another reason why it is called “Hilton’s White Line”.
Intersphincteric groove - Location
The furrow is positioned a little below the pectinate line, which forms the intermuscular border between the internal and external anal sphincter and also divides the upper 2/3s and lower 1/3 of the anal canal.
Intersphincteric groove - Pictures
The following images would help you know how the furrow looks like in human beings.
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