puborectalis

noun

pu·​bo·​rec·​ta·​lis ˌpyü-bō-rek-ˈtā-ləs 

: a band of muscle fibers that is part of the pubococcygeus, that passes from the pubic symphysis to interdigitate with the contralateral band of fibers forming a sling around the rectum at its junction with the anal canal, and that acts to hold the rectum and anal canal at right angles to each other except during defecation