Bony Pelvis Anatomy

Question 1

how does the bony pelvis allow standing and walking?

Answer 1

transfers weight from vertebral column to the femurs

Question 2

what attaches to the bony pelvis?

Answer 2

external genitalia

muscles of locomotion

abdominal wall

Question 3

what is each hip bone a fusion of?

Answer 3

ilium

ischium

pubis

Question 4

what does the bony pelvis consist of?

Answer 4

2 hip bones

sacrum

coccyx

Question 5

Answer 5

Question 6

Answer 6

Question 7

Answer 7

Question 8

what is the pelvic inlet between?

Answer 8

Question 9

what is the pelvic outlet between?

Answer 9

Question 10

what does the pelvic cavity lie between?

Answer 10

pelvic inlet and pelvic floor

Question 11

anteriorly, what are palpable surface landmarks of the pelvis?

Answer 11

iliac crest

ASIS

pubic symphysis

pubic tubercle

Question 12

posteriorly, what are palpable landmarks of the pelvis?

Answer 12

iliac crest

sacrum

PSIS

coccyx

ischial tuberosity

Question 13

what attaches between the ASIS and the pubic tubercle?

Answer 13

inguinal ligament

Question 14

in what examination and where are the ischial spines palpable?

Answer 14

vaginal examination

4 and 8 o’clock positions

Question 15

label this x ray

Answer 15

Question 16

label this x ray

Answer 16

Question 17

what are the joints of the pelvis? label them

Answer 17

Question 18

what are the two main ligaments of the pelvis?

Answer 18

sacrotuberous

sacrospinous

Question 19

what does the sacrospinous ligmant run between?

Answer 19

sacrum

ischial spine

Question 20

what does the sacrotuberous ligmant run between?

Answer 20

sacrum

ischial tuberosity

Question 21

what do the two ligaments form?

Answer 21

greater and lesser sciatic foramen

Question 22

what is the function of the ligaments?

Answer 22

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

Question 23

what covers the obturator forman? where is this not present?

Answer 23

obturator membrane

not present at superior margin

Question 24

what passes through the obturator canal? where does its contents go?

Answer 24

obturator nerve, artery and vein

medial compartment of the thigh

Question 25

what artery/veins can be damaged if there is trauma to the bony pelvis?

Answer 25

common iliac artery and vein

Question 26

what is moulding?

Answer 26

movement of one bone over another to allow the fetal head to pass through the pelvis during labour

Question 27

what allows moulding to occur?

Answer 27

sutures and fontanelles

Question 28

label the sutures, fontanelles and bones

Answer 28

Question 29

label the sutures, fontanelles and bones

Answer 29

Question 30

what is important about the diametes of the fetal skull, in relation to childbirth?

Answer 30

occipitofrontal diameter is longer than the biparietal diameter

Question 31

what is a vertex birth?

Answer 31

head first

Question 32

what features of the pelvis help with childbirth?

Answer 32

at the pelvic inlet, transverse diameter of the pelvis is wider than the AP diameter

Question 33

what is the station?

Answer 33

distance of fetal head from ischial spines

negative = head is superior

positive = head is inferior

Question 34

what position should the fetal head be in when ascending the pelvic cavity?

Answer 34

rotated

flexed (chin on chest)

Question 35

what position should the baby leave the pelvic cavity in? (ideally)

Answer 35

occipitoanterior position (head in extension)

Question 36

where should the fetal head be in the

1. pelvin inlet
2. pelvic cavity
3. pelvic outlet

Answer 36

1. transverse (either direction)
2. rotated and flexed (either direction 45 degrees)
3. occipitoanterior and extended

Question 37

label

Answer 37