Muscular walls and diaphragm Flashcards
muscles that make up walls of the pelvic cavity
- piriformis
- obturator internus
where do the piriformis and obturator internus exit the pelvic cavity
Piriformis –> greater sciatic foramen
obturator internus –> lesser sciatic foramen
obturator internus origin
pelvic surface of ilium, ischium and obturator membrane/fascia
- bones at obturator foramen
piriformis origin
- pelvic surface of sacrum (S2-S4)
- Sacrotuberous ligament
- upper margin of greater sciatic notch
obturator internus insertion
Trochanteric fossa/ medial aspect of greater trochanter
piriformis insertion
tip of greater trochanter
name of the hole in obturator internus and function
- obturator canal
- neurovascular pathway
what tendinous structure is attached to the fascia of the obturator internus
- tendinous arch of the levator ani (very thick)
name the levator ani muscles
- Puborectalis
- Pubococccygeus
- ilicoccygeus
muscles associated with the floor/pelvic diaphragm
- levator ani muscles
- Ischiococcygeus muscles
location of anococcygeal ligament
- coccyx to anus
why do female have “less” muscles in their pelvic floor/diaphragm
- in order to stretch more in child birth
- leads to less pelvic support with age
