Musculature of Pelvic Walls and Floor Flashcards
Which muscles make up the walls of the pelvic cavity?
Obturator internus
Piriformis
Which muscles (or muscle groups) contribute to the floor of the pelvic cavity?
Levator Ani
Ischiococcygeus
Which muscles make up Levator Ani?
Puborectalis
Pubococcygeus
Iliococcygeus
What is the iliopubic eminence?
A bump that marks the point of union between the ilium and pubis
Where is the groove over which psoas major and iliacus pass?
Medial to AIIS, lateral to iliopubic eminence
How many openings are there in the pelvic diaphragm? What are they called?
2:
Urogenital hiatus
Anal hiatus
Which bony landmarks does the fascia of obturator internus tendinous arch of levator ani pass between?
Pubic bone to ischial spine
Where does obturator internus exit the pelvic cavity?
Lesser sciatic foramen
Where does piriformis exit the pelvic cavity?
Greater sciatic foramen
Where does obturator internus originate?
On posterior aspect of pubic bone
Where does piriformis originate?
On anterior aspect of sacrum
Where does piriformis distally insert?
On superior tip of greater trochanter
Where does obturator internus distally insert?
Trochanteric fossa or medial aspect of greater trochanter
Which muscle forms a sling around the rectum?
Puborectalis
Which muscles of the pelvic diaphragm are in the shape of triangles?
Iliococcygeus
Ischiococcygeus
