Anatomy of the Bony Pelvis

Question 1

What is part of the bony pelvis but not part of the pelvic girdle?

Answer 1

coccyx

Question 2

What type of cartilage makes up the acetabulum in children and adolescents?

Answer 2

hyaline-triradiate cartilage

Question 3

What is the largest bone of the hips?

Answer 3

ilium

Question 4

What forms the pelvic inlet?

Answer 4

sacral promontory; ilium; superior pubic ramus and pubic symphysis

Question 5

What forms the pelvic outlet?

Answer 5

pubic symphysis; ischiopubic ramus; ischial tuberosities; sacrotuberous ligaments; coccyx

Question 6

Where does the pelvic cavity lie?

Answer 6

between the pelvic inlet and pelvic floor

Question 7

Where does the inguinal ligament attach?

Answer 7

between ASIS and pubic tubercle

Question 8

Where are the ischial spines palpable on vaginal examination?

Answer 8

approx. 4 and 8 o clock positions

Question 9

What is the point of palpating the ischial spines on vaginal exam?

Answer 9

used during lacbour as a measure of how far along

Question 10

What does the sacrospinous ligament attach between?

Answer 10

sacrum and ischial spine

Question 11

What does the sacrotuberous ligament attach between?

Answer 11

sacrum and ischial tuberosity

Question 12

What is the function of the sacrotuberous and sacrospinous ligaments?

Answer 12

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

Question 13

Where do the obturator nerves and vessels travel in the obturator foramen?

Answer 13

obturator canal-superiorly in the foramen

Question 14

What are the differences between the male and female pelvises?

Answer 14

AP and transverse diameters of F are larger at inlet and outlet; subpubic angle in F is greater; pelvic cavity is much shallower in F; bones are thinner and gracile in F; greater sacral promontory in M; bigger greater sciatic notch in F; M inlet is heart shaped not round as in F

Question 15

What is moulding?

Answer 15

movement of one bone over another to allow the fetal head to pass through the pelvic

Question 16

What allows moulding to occur?

Answer 16

sutures and fontanelles

Question 17

Where is the posterior fontanelle found?

Answer 17

at the intersection between the sagittal and lambdoid sutures

Question 18

Where is the anterior fontanelle found?

Answer 18

intersection between sagittal and coronal sutures

Question 19

What is the vertex?

Answer 19

area of fetal skull outlined by the anterior and posterior fontanelles and parietal eminences

Question 20

What is the difference between the biparietal and occipitofrontal diameters in fetal skull?

Answer 20

occipitofrontal diameter is longer; eg fetal head is longer than it is wide

Question 21

What is the distance of the fetal head from the ischial spines known as ?

Answer 21

the station

Question 22

What is the diameters of the transverse and AP at hte pelvic inlet of F?

Answer 22

transverse is wider

Question 23

How should the fetus ideally enter the pelvic cavity?

Answer 23

head in transverse position as occipitofrontal is longer and so is transverse diameter of pelvis

Question 24

What is the dimeters of the transverse and AP at the pevlic outlet in F?

Answer 24

AP is bigger than transverse

Question 25

What should happen to the fetal head when descending through the pelvic cavity?

Answer 25

rotate and be in a flexed position

Question 26

How should baby ideally leave the pelvic cavity?

Answer 26

occipitoanterior position

Question 27

How should the fetal head be during delivery?

Answer 27

in extension

Question 28

What type of joint is the anterior sacro-iliac joint?

Answer 28

synovial

Question 29

what type of joint is the posterior sacro-iliac joint?

Answer 29

syndesmosis

Question 30

What type of joint is the pubic symphysis?

Answer 30

secondary cartilaginous joint