The Sphincter is two Fingers broad, to open and close the rectum.
rectum, which carries away the solid waste matter from the bowels.
rectum I take to indicate that the instrument was straight and not a curved bistoury.
rectum, rek′tum, n. the lowest part of the large intestine:—pl.
"rectum" followed "exterius" in the written copy, wherein "s. albidus" and "antice sinu excavata" were not to be found.
early 15c., from Latin intestinum rectum "straight intestine," in contrast to the convolution of the rest of the bowels, from neuter past participle of regere "to straighten" (see regal). A loan-translation of Greek apeuthysmeon enteron, "the name given to the lowest part of the large intestine by Galen, who so called it because he dissected only animals whose rectum (in contradistinction to that of man) is really straight" [Klein].
rectum rec·tum (rěk'təm)
n. pl. rec·tums or rec·ta (-tə)
The terminal portion of the large intestine, extending from the sigmoid flexure to the anal canal.