Ach: Pelvic floor Flashcards
What forms the pelvic brim?
sacral promontory and ala
iliopectineal line
symphysis pubis
What covers most of the lateral wall of the true pelvis?
obturator internus
What is the origin of the obturator internus?
obturator membrane covering the obturator foramen surrounding the bone
Where does the obturator internus insert?
Fibers converge and the tendon passes through the lesser
sciatic foramen to insert on the greater trochanter (medially).
What is the O and I for the piriformis?
O: anterior aspect of the sacrum between the sacral foramina
> greater sciatic foramen
I: greater trochanter superiorly
What supports the pelvic viscera and is formed by the pelvic diaphragm?
pelvic floor
What dives the pelvic cavity into the pelvis and perineum?
pelvic diaphragm
What are the anterior and posterior divisions of the pelvic diaphragm?
levator ani
coccygeus
What is the origin of the levator ani?
Lateral pelvic wall from the pubic bone to the ischial spine
What forms the tendinous arch?
between these two bony attachments, the pelvic diaphragm arises from the PARIEATAL PELVIC FASCIA covering the internal aspect of the obturator internus muscle; this fascia is thickened to form a tendinous arch
Where does the levator ani insert?
the muscles sweep downward and medially to insert midline (from the central perineal tendon to the coccyx)
What perforates the pelvic diaphgram? How does it differ in M and F?
M- anal canal and urethra
F- anal canal, vagina, urethra
What forms the posterior and smaller part of the pelvic diaphragm?
coccygeus (blends w/ the sacrospinous ligament on its internal surface
The coccygeus extends from the ischial spine to the….
lower sacrum and coccyx
What are the actions of the pelvic diaphragm?
Support pelvic floor and the organs that pierce it.
Resists outward thrust accompanying increases in intra-abdominal pressure (forced expiration and coughing).
Assists in defecation.
