anorectal junction

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].
References in periodicals archive ?
Repeat colonoscopy revealed a circumferential non-pigmented poorly-differentiated low rectal tumour at the anorectal junction.
It is unusual to find systemic failure in the absence of liver metastases,[1] although the portosystemic shunting that exists at the anorectal junction does permit hematogenous spread outside the portal circulation to the internal iliac vessels and the cava.