The Probert Encyclopaedia of Medicine

LEVATOR ANI-PUBORECTALIS

The levator ani-puborectalis originates from the back of the pubis, passes around the anus and inserts in the sides of the lower part of the sacrum and coccyx. This muscle relaxes during defecation. It is innervated by the fourth sacral nerve.
Research Levator Ani-puborectalis