NCIt related terms : Anal canal structure (body structure);
NCIt definition : The terminal section of the alimentary canal, which extends from the anorectal junction
and ends at the anal opening.;
Alternative definition : ICDO3: excludes skin of anus and perianal skin C44.5; CDISC: The terminal section of the alimentary canal, which extends from the anorectal
junction and ends at the anal opening. (NCI); UBERON: The terminal part of the large intestine, continuous proximally with the rectum
and distally terminates with the anus.;