The pelvic floor is bounded anteriorly by the _____, posteriorly by the _____, and laterally by the ____.
All muscles of the perineum are innervated by what nerve?
What are the 4 muscles of the pelvic floor?
- Levator ani
- External urethral sphincter
- External anal sphincter
2 Parts of the Levator Ani
Where is the levator ani located?
it is a broad flat muscle that surrounds the anus
What is the function of the levator ani?
to elevate the perineum and constrict the anus to hold in fecal matter
Where does the coccygeus muscle originate and insert?
Originates on the ischial spine and inserts onto the inferior ends of the sacrum and coccyx
What is the function of the coccygeus muscle?
to constrict the anus and hold fecal matter in the rectum
Where does the iliococcygeus originate and insert?
arises from the inner side of the ischium and the posterior part of arch of the obturator and inserts onto the coccyx
Where does the pubococcygeus originate and insert?
it is the hammock-like muscle that stretches from the pubic bone to the coccyx