Pelvic Wall

Question 1

Boundaries of the Pelvic Brim

Answer 1

• (post.) Sacral promontory
• (lat.) Iliopectineal lines
• (ant.) Symphysis pubis

Question 2

What exits the greater sciatic foramen

Answer 2

1. Sciatic nerves
2. Pudendal nerves
3. Gluteal nerves and vessels

Question 3

The lesser sciatic foramen transmits the

Answer 3

1. Pudendal nerve
2. Internal pudendal vessels

Question 4

False pelvis?

Answer 4

Above the pelvic brim

Question 5

True pelvis composed of

Answer 5

Inlet (pelvic brim), outlet, and cavity

Question 6

Pelvic outlet is bounded by

Answer 6

• (post.) coccyx
• (lat.) ischial tuberosity
• (ant.) pubic arch

Question 7

Pubic arch is formed by

Answer 7

Ischiopubic rami

Question 8

False pelvis boundaries

Answer 8

• (post.) lumbar vertebrae
• (lat.) Iliac fossa & iliacus muscle
• (ant.) lower part of ant. abdominal wall

Question 9

Anterior pelvic wall formed by

Answer 9

(1) bodies of pubic bone
(2) pubic rami
(3) symphysis pubis

Question 10

Posterior pelvic wall formed by

Answer 10

(1) sacrum & coccyx
(2) piriformis muscle
(3) parietal pelvic fascia

Question 11

The sacral canal contains

Answer 11

(1) ant. and post. roots of the lumbar, sacral, & coccygeal spinal nerves
(2) filum terminale
(3) fibrofatty material

Question 12

Piriformis muscle (OIAN)

Answer 12

O: Anterior part of the lateral mass of the sacrum
I: Upper border of the greater trochanter
A: lateral rotator of femur at the hip joint
N: Sacral plexus

Question 13

Lateral pelvic wall components:

Answer 13

(1) hip bone below the pelvic inlet
(2) obturator membrane
(3) obturator internus muscle and its fascia
(4) sacrotuberous and sacrospinous ligament

Question 14

Obturator Internus muscle (OIAN)

Answer 14

O: pelvic surface of the obturator membrane and
adjoining part of the hip bone
I: greater trochanter of the femur
A: same with piriformis muscle
N: sacral plexus

Question 15

Inferior pelvic wall divides pelvis into

Answer 15

(1) main pelvic cavity
(2) perineum

Question 16

Inferior pelvic wall formed by

Answer 16

Pelvic diaphragm and its associated fascia

Question 17

Pelvic diaphragm is formed by

Answer 17

(1) levator ani muscles
(2) coccygeus muscles

Question 18

Levator ani muscles

Answer 18

(1) iliococcygeus m.
(2) pubococcygeus m.
(3) puborectalis m.

Question 19

Levator ani muscles (OIAN)

Answer 19

O: Body of the pubis, fascia of obturator internus, Spine of ischium

I: Perineal body

A: Supports pelvic viscera, sphincter for anorectal Junction and vagina

N: Perineal branch of S4 and pudendal nerve

Question 20

Coccygeus muscle (OIAN)

Answer 20

O: Spine of ischium
I: Lower end of sacrum, coccyx
A: Support pelvic viscera
N: S4 and S5 nerve

Question 21

Pelvic ligaments arise from

Answer 21

Visceral pelvic fascia

Question 22

Where does the sacral plexus lie?

Answer 22

At the posterior pelvic wall infront of the piriformis muscle

Question 23

Sacral plexus is formed by

Answer 23

L4 - L5 and S1 - S4

Question 24

Lumbrosacral trunk is formed by

Answer 24

L4 and L5

Question 25

Anterior to the sacral plexus is the

Answer 25

Internal iliac vessels

Question 26

Obturator nerve is formed by

Answer 26

L2, L3, and 4

Question 27

Pudendal branch of the sacral plexus is formed by

Answer 27

S2, 3, 4

Question 28

Sciatic nerve of the sacral plexus is formed by

Answer 28

L4 - 5, S2 - 3

Question 29

Branches of the Sacral plexus

Answer 29

• lumbrosacral trunk
• superior gluteal nerve
• inferior gluteal nerve
• nerve to obturator internus
• nerve to quadratus femoris
• sciatic nerve
• posterior cutaneous nerve to the thigh
• perforating cutaneous nerve
• pudendal nerve

Question 30

Stimulus that triggers the voiding (micturition) or urination reflex

Answer 30

bladder wall stretch

Question 31

MALE VS. FEMALE PELVIS

Answer 31