Anatomy 1: Bony Pelvis Anatomy

Question 1

What does the bony pelvis consist of?

Answer 1

2 hip bones
Sacrum
Coccyx

Question 2

Each hip bone is a fusion between?

Answer 2

Ilium
Ischium
Pubis

Question 3

What are the ligaments of the pelvis?

Answer 3

Sacrospinous ligament (smaller)
Sacrotuberous ligament (larger)

Question 4

Where does the sacrospinous ligament attach?

Answer 4

To the sacrum and ischial spine

Question 5

Where does the sacrotuberous ligament attach?

Answer 5

Between the ischial spine and a broad attachment on the sacrum

Question 6

What is the function of the sacrotuberous and sacrospinous ligaments?

Answer 6

Ensure that the inferior part of the sacrum is not pushed superiorly when weight is suddenly transferred vertically through the vertebral column

Question 7

What happens to the ligaments of the pelvis during pregnancy?

Answer 7

They relax

Question 8

What is the course of the pudendal nerve?

Answer 8

Leaves through the greater sciatic foramen and returns through the lesser sciatic foramen

Question 9

What makes up the pelvic inlet?

Answer 9

Sacral promontory
Ilium
Superior Pubic Ramus
Pubic Symphysis

Question 10

What makes up the pelvic outlet?

Answer 10

Pubic Symphysis
Ischiopubic ramus
Ischial tuberosities
Sacrotuberous ligaments
Coccyx

Question 11

What are the features of the male pelvis?

Answer 11

• Thick, robust bone
• Narrow, deep pelvis
• Heart shaped, narrow pelvis inlet, small pelvic outlet
• Narrow subpubic angle
• Round obturator foramen
• Narrow greater sciatic notch

Question 12

What are the features of the female pelvis?

Answer 12

• Thin, light bone
• Wide, shallow pelvis
• Rounded, wide pelvic inlet, large pelvic outlet
• Wide subpubic angle
• Oval obturator foramen
• 90degree greater sciatic notch

Question 13

What is the vertex?

Answer 13

An area of the baby’s skull outlined by the anterior and posterior fontanelles and the parietal eminences

Question 14

At the pelvic inlet, the transverse diameter of the pelvis is wider then the AP diameter T/F?

Answer 14

True

Question 15

Explain the 3 steps of passage through the birth canal during labour

Answer 15

1) At the pelvic inlet, the baby’s head should be transverse
2) As it descends through the pelvic cavity, the head should rotate and it should be flexed
3) At the pelvic outlet, the baby’s head should ideally lie occipitoanterior and extension of the head on the neck should occur