1. PELVIC BONES
Hip bone
Sacrum
coccyx 1

12. PELVIC MUSCLES
piriformis
obturator internus
levator ani
coccygeus

13. laterally rotates and abducts thigh greater trochanter of femur
Action
Insertion
Origin
Muscle
laterally rotates and abducts thigh
greater trochanter of femur
anterior surface of sacrum
piriformis
laterally rotates and abducts the thigh
greater trochante
the internal surface of the obturator membrane and margin of the obturator foramen
obturator internus
elevates the pelvic floor
perineal body, anococcygeal body and coccyx
posterior surface of the body of the pubis, fascia of the obturator internus m., ischial spine
levator ani
side of the coccyx and lower sacrum
ischial spine
coccygeus

15. Levator ani is the main muscle of the pelvic floor
Levator ani is the main muscle of the pelvic floor. It forms a funnel-shaped diaphragm in the pelvis between the lateral hip walls, the pubis anteriorly and the coccyx posteriorly. It is traversed by different structures in each sex:
males:
urethra
anal canal
females:
vagina
Often, levator ani is considered as several separate muscle parts:
pubovaginalis
iliococcygeus
pubococcygeus
puborectalis
However they have common features:
origin: from a tendinous arch between the pubis and ischial spine on the internal surface of the pelvis
insertion:
perineal body
external wall of anal canal
anococcygeal ligament
coccyx