anorectal junction

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a·no·rec·tal junc·tion

[TA]
transition from rectum to anal canal; corresponds to the perineal flexure, or the level at which the gut perforates the pelvic diaphragm; here the rectal ampulla narrows abruptly into a narrow slip.
Synonym(s): junctio anorectalis [TA]

anorectal junction

(1) Anorectal line; linea anorectalis [NA6, NH3]; dentate line, pectinate line. 
(2) Anocutaneous line; linea anocutanea [NH3].