Anatomy - Bony Pelvis

Question 1

what is the bony pelvis made of?

Answer 1

two hip bones
sacrum
coccyx

Question 2

what does a hip bone consist of?

Answer 2

ilium
ischium
pubis

Question 3

what forms the outline of the pelvic inlet?

Answer 3

sacral promontory
ilium
superior pubic ramus

Question 4

what forms the outline of the pelvic outlet?

Answer 4

pubic symphysis 
ischiopubic rams 
ischial tuberosities 
sacrotuberous ligaments 
coccyx

Question 5

where is the pelvic cavity located?

Answer 5

within the bony pelvis

in between the pelvic inlet and the pelvic floor

Question 6

where does the inguinal ligament attach?

Answer 6

between the ASIS and the pubic tubercle

Question 7

when are the ischial spines palpable?

Answer 7

on vaginal examination

Question 8

what are the two main ligaments of the pelvis?

Answer 8

sacrospinous

sacrotuberous

Question 9

where does the sacrospinous ligament attach?

Answer 9

between the sacrum and the ischial spine

Question 10

where does the sacrotuberous ligament attach?

Answer 10

between the sacrum and the ischial tuberosity

Question 11

what is the main function of the ligaments of the pelvis?

Answer 11

protect against sudden weight transfer

Question 12

what happens to the ligaments of the pelvis during pregnancy?

Answer 12

they relax

Question 13

what do the sacrospinous and sacrotuberous ligaments in the pelvis form?

Answer 13

the greater and lesser sciatic foramina

Question 14

describe the differences between a male and female pelvis

Answer 14

overall a females pelvis is larger, wider and shallower than a males

Question 15

what is moulding and when does this occur?

Answer 15

movement of bones over each other in the foetal skull to allow the head to pass through the pelvis during labour

Question 16

what allows moulding of the foetal skull to occur?

Answer 16

the anterior and posterior fontanelles

Question 17

where is the vertex located?

Answer 17

between the anterior and posterior fontanelles and the parietal eminences in the foetal skull

Question 18

which diameter of the foetal skull is longer - occipitofrontal (back to front) or biparietal (left to right)?

Answer 18

occipitofrontal

Question 19

what direction should the foetuses head be facing when entering the pelvic cavity and why?

Answer 19

either to the right or left (transverse)

the transverse diameter of the pelvis is wider than the AP diameter

Question 20

what Is the station of a foetal head?

Answer 20

the distance of the foetal head from the ischial spines

Question 21

what does it mean if the station is a negative number?

Answer 21

foetal head is superior to the ischial spines

Question 22

what does it mean if the station is a positive number?

Answer 22

the foetal head is inferior to the ischial spines

Question 23

what should happen to the foetal head as it passes through the pelvic cavity?

Answer 23

should rotate

be in a flexed position (chin to chest)

Question 24

what position should the babies head be in as it exits the pelvic cavity and why?

Answer 24

occipitoanterior (OA) position

AP diameter is wider than transverse diameter at the pelvic outlet

Question 25

what is the OA position?

Answer 25

the occipital bone at the back of the babies head is at the anterior surface of the mother

essentially face down and head first

Question 26

what position should the babies head be in during delivery - extension or flexion?

Answer 26

extension