Bony Pelvis Anatomy

Question 1

What are the components of the bony pelvis?

Answer 1

2 hip bones
Sacrum
Coccyx

Question 2

What are the 3 fused structures which form a hip bone?

Answer 2

Ilium
Ischium
Pubis

Question 3

What are the bony features of the Ilium?

Answer 3

Iliac crest
Iliac fossa
Anterior superior iliac spine (ASIS)
Posterior superior iliac spine (PSIS)

Question 4

At which site does the iliac muscle attach?

Answer 4

Iliac fossa

Question 5

What are the bony features of the Ischium?

Answer 5

Ischiopubic ramus
Ischial tuberosity
Ischial spine

Question 6

What are the bony features of the Pubis?

Answer 6

Ischiopubic ramus
Pubic tubercle
Superior pubic ramus

Question 7

What are the joints of the pelvis?

Answer 7

Sacroiliac joint x2
Hip joint x2
Pubic Symphysis

Question 8

What are the attachments of the inguinal ligament?

Answer 8

ASIS and pubic tubercle

Question 9

What are the attachment points of the sacrospinous ligament?

Answer 9

Sacrum to ischial spine

Question 10

What are the attachment points of the sacrotuberous ligament?

Answer 10

Sacrum to tubercle

Question 11

The presence of the sacrotuberous and sacrospinous ligaments give rise to what?

Answer 11

Greater and lesser sciatic foramen.

Question 12

What structures form the pelvic inlet?

Answer 12

Sacral promontory
Ilium
Superior pubic ramus
Pubic symphysis

Question 13

What structures form the pelvic outlet?

Answer 13

Pubic symphesis
Ischiopubic ramus
Ischial tuberosities
Sacrotuberous ligaments
Coccyx

Question 14

What is an important principle to remember when dealing with trauma to the pelvis?

Answer 14

Fracture tends to occur in more than one place.

Question 15

What 3 differences are found in the female pelvis compared to the male?

Answer 15

1) The AP and transverse diameters are larger
2) The subpubic angle (and pubic arch) is wider
3) The pelvic cavity is shallower in the female

Question 16

What are the areas on the foetal skull not yet ossified called? (soft spots)

Answer 16

Fontanelles - anterior (largest) and posterior.

Question 17

What area on the foetal skull is outlined by the anterior and posterior fontanelles and the parietal eminences?

Answer 17

Vertex

Question 18

What name is given to the length along the foetal skull anterior to posterior?

Answer 18

Occipitofrontal diameter

Question 19

What name is given to the width along the foetal skull left to right?

Answer 19

Biparietal diameter

Question 20

What is meant by the term ‘station’ with regard to childbirth?

Answer 20

The distance of the foetal head from the ischial spines

Question 21

What is the meaning of a negative value for the station?

Answer 21

The foetal head is superior to the ischial spines.

Question 22

What is the meaning of a positive value for the station?

Answer 22

The foetal head is inferior to the ischial spines.

Question 23

What is the ideal position for the baby to leave the pelvic cavity?

Answer 23

The occipitoanterior position

Question 24

What positions should the foetal head assume along the birth canal?

Answer 24

At pelvic inlet - Transverse
On descent - Rotated and flexed
At pelvic outlet - Extended and in occipitoanterior position.