Bony pelvis

Question 1

Bony pelvis is made up of

Answer 1

2 hip bones: anterior and laterally.
Sacrum and coccyx: posteriorly.

Question 2

The 2 hip bones articulate in the midline anteriorly by

Answer 2

pubic symphysis

Question 3

The hip bone articulates posteriorly with the sacrum by

Answer 3

sacroiliac joint

Question 4

Pubic symphysis is what type of joint
Sacroiliac joint is what type of joint

Answer 4

symphyses-secondary cartilaginous
synovial joint- plane

Question 5

Divisions of the pelvis

Answer 5

Greater or false pelvis
Lesser or true pelvis

Question 6

Greater pelvis

Answer 6

Bounded by iliac fossa on each side.
Cavity forms lower part of abdominal cavity.

Question 7

Lesser pelvis

Answer 7

Lies below level of pelvic brim.
It is the space enclosed between the pelvic inlet and outlet.

Question 8

The junction between the greater and lesser pelvis is known as

Answer 8

Pelvic inlet.

Question 9

The outer bony edges of the pelvic inlet

Answer 9

Pelvic brim

Question 10

Borders of pelvic inlet

Answer 10

Posterior – sacral promontory and sacral wings or ala.
Lateral – arcuate line on the inner surface of the ilium, and the pectineal line on the superior pubic ramus.
Anterior – pubic symphysis.

Question 11

What determines size of birth canal

Answer 11

Pelvic inlet.

Question 12

Where is the pelvic outlet located

Answer 12

At the end of the lesser pelvis and at the beginning of the pelvic wall

Question 13

Boundaries of pelvic outlet

Answer 13

Posterior: The tip of the coccyx

Lateral: The ischial tuberosities and the sacrotuberous ligament

Anterior: The pubic arch

Question 14

The angle beneath the pubic arch is known as

Answer 14

Sub-pubic angle
Greater size in women.

Question 15

Boundaries of lesser pelvis

Answer 15

Anterior and below- pubic symphysis, body of pubis and pubic rami.

Posterior and above-pelvic surface of sacrum and coccyx.

On each side-pelvic surface of ilium and ischium.

Question 16

Male pelvis

Answer 16

Heavier and stronger.
Bony markings are more prominent.
Joint surfaces are larger.
Greater or false pelvis is deep.
Anterior superior iliac spine is inverted.
Pelvic inlet is heart shaped.
Pelvic cavity is deep and funnel shaped.
Pelvic outlet is narrower.
Coccyx projects forward.

Question 17

Female pelvis

Answer 17

Lighter and thinner.
Bony markings are less prominent.
Joint surfaces are smaller.
Greater or false pelvis is shallow.
Anterior superior iliac spine is everted.
Pelvic inlet is oval or rounded.
Pelvic cavity is shallow and tubular
Pelvic outlet is wider.
Coccyx projects downwards.

Question 18

Types of pelvis

Answer 18

Gynaecoid.
Android.
Platypelloid.
Anthropoid.

Question 19

Gynaecoid 50%

Answer 19

Commonest female type.

Inlet is slightly oval along the transverse axis.

Wide and shallow pelvic cavity.

Ischial spines are blunted and do not protrude into the cavity.

Sacrum is broad and has a deep concavity.

Ideal for delivery.

Question 20

Android 20%

Answer 20

Resemble male pelvis.

Inlet is heart-shaped (large sacral promontory).

Pelvic cavity is funnel shaped.

Ischial spines are conical and protrude into the cavity.

Sacrum is slightly curved.

Question 21

Anthropoid 25%

Answer 21

It has features of both the android and gynaecoid pelvis.

Inlet is oval in the anteroposterior axis.

Deep pelvic cavity.

Ischial spines are blunt.

Sacrum is long, narrow and less curved than in the gynaecoid pelvis.

Can facilitate delivery but high risk of obstructed labor

Question 21

Platypelloid 5%

Answer 21

Flat type of pelvis.

Shallow pelvic cavity.

Sacrum is slightly curved.