Pelvic muscles

Question 1

Piriformis

Answer 1

O- sacral body
I- Greater trocanter of femur
A- hip rotator
In- L5, S1
Bs- gluteal and pudendal arteries

Leaves pelvis through greater sciatic foramen
Can irritate sciatic nerve
Makes up posterior pelvic wall along with sacrum and coccyx

Question 2

Coccygeus

Answer 2

O- Ischial spine
I- Coccyx
A- support of pelvic viscera
In- S4, S5
Bs - internal iliac artery

Question 3

Puborectalis

Answer 3

O- tendinous arch (medial)
I- tendinous arch (medial)
A- maintainence of ano-rectal angle
In- S2, S3, S4 branches of pudendal nerve
Bs- inferior gluteal

Question 4

Pubococcygeus

Answer 4

O- tendinous arch and pubic body
I- coccyx and anococcygeal body
A- support of pelvic viscera
In- S2, S3, S4 branches of pudendal nerve
Bs- Inferior gluteal artery

Question 5

Iliococcygeus

Answer 5

O- tendinous arch (lateral) and ischial spine
I- coccyx
A- support of pelvic viscera
In- S2, S3 and S4 branches of pudendal nerve
Bs- Inferior gluteal artery

Question 6

Obturator internus

Answer 6

O- pubic body and obturator membrane
I- greater trocanter of femur
A- hip rotator
In- S1 and S2 branches of sacral nerves
Bs- superior gluteal

Leaves through lesser sciatic foramen
Conducts obturator canal
Makes up the lateral pelvic wall