Pelvis: Bones + Muscles

Question 1

What type of joint is the pubic symphysis?

Answer 1

Secondary cartilaginous

Question 2

What type of joint is the sacroiliac joint?

Answer 2

Synovial

Question 3

Which bones of the pelvis form the obturator foramen?

Answer 3

Ischium and superior rami of the pubis

Question 4

Which structures pass through the obturator canal?

Answer 4

Obturator nerve L2-L4
Obturator vein
Obturator artery (branch of ADIIA)

Question 5

Which structure defines and separates the greater and lesser sciatic notches?

Answer 5

Ischial spines

Question 6

Which ligament forms the greater sciatic notch?

Answer 6

Sacrospinous ligament

Question 7

Which ligament forms the lesser sciatic notch?

Answer 7

Sacrotuberous ligament

Question 8

Which two muscles form the side walls of the pelvis?

Answer 8

Piriformis

Obturator internus

Question 9

Which nerve innervates the piriformis muscle?

Answer 9

Nerve to piriformis L5-S2

Question 10

What are the attachments of the piriformis muscle?

Answer 10

Anterior surface of the sacrum
Leaves the pelvis via the greater sciatic foramen
Attaches to greater trochanter of the femur

Question 11

What is the action of the piriformis muscle?

Answer 11

External rotation of the hip

Question 12

Which nerve innervates the obturator internus?

Answer 12

Nerve to obturator internus L5-S2

Question 13

What are the attachments of the obturator internus?

Answer 13

Obturator membrane
Leaves pelvis via the lesser sciatic foramen
Attaches to greater trochanter of the femur

Question 14

What is the action of the obturator internus?

Answer 14

External rotation of the hip

Question 15

Which two muscles form the pelvic diaphragm?

Answer 15

Levator ani

Coccygeus

Question 16

What are the three parts of the levator ani?

Answer 16

Puborectalis
Pubococcygeus
Iliococcygeus

Question 17

What is the blood supply to the levator ani?

Answer 17

Inferior rectal and internal pudendal arteries

Question 18

What is the nerve supply to the levator ani?

Answer 18

Pudendal nerve

Question 19

What are the boundaries of the deep perineal pouch?

Answer 19

S: levator ani
I: Perineal membrane

Question 20

What are the contents of the deep perineal pouch?

Answer 20

Deep transverse perineal muscle
External urethral sphincter
Bulbourethral glands

Question 21

What are the boundaries of the superficial perineal pouch?

Answer 21

S: perineal membrane
I: perineal fascia

Question 22

What are the contents of the superficial perineal pouch?

Answer 22

Ischiocavernosus
Bulbocavernosus
Superficial perineal muscles
Batholin glands 
Crura of the clitoris

Question 23

What is the boundary between the false pelvis and the true pelvis?

Answer 23

Pelvic inlet

Question 24

What is the boundary between the true pelvis and the perineum?

Answer 24

Levator ani

Question 25

The plane of the pelvic inlet is at what angle to the horizontal?

Answer 25

60

Question 26

What anatomical landmark is used for gauging the station of the foetal head during labour?

Answer 26

Ischial spines

Question 27

What is the nerve supply to the coccygeus muscle?

Answer 27

Anterior rami of S4 and S5

Question 28

Which muscle forms the bulk of the levator ani?

Answer 28

Pubococcygeus

Question 29

Which structures attach to the perineal body?

Answer 29

External anal sphincter Transverse perineal muscles Levator ani Bulbospongiosus

Question 30

What are the nerve roots of the sciatic nerve?

Answer 30

L4-S3