birth canal and fetal skull

Question 1

false pelvis

Answer 1

P: lumbar
L: iliac fossa
A: abdominal wall

Question 2

true pelvis

Answer 2

P: pelvic outlet
A: promontory, alae, linea terminalis, pubic bones

Question 3

shortest diameter of true pelvis

Answer 3

ischial spines

Question 4

pelvic inlet

Answer 4

P: promontory & sacrum
L; linea terminalis
A: pubic symphysis

Question 5

AP diameter

Answer 5

widest diameter
true conjugate (upper symphysis)
11cm

Question 6

inlet transverse diameter

Answer 6

13cm

Question 7

inlet oblique diameter

Answer 7

<13cm

Question 8

inlet obstetric conjugate

Answer 8

10.5cm

point of most bulging back of symphysis

Question 9

diagonal conjugate

Answer 9

12cm

lower edge of symphysis

Question 10

midpelvis

Answer 10

ischial spine (st 0)
AP diameter of 11.5cm

Question 11

pelvic outlet

Answer 11

A: pubic arch
L: ischiopubic arm, ischial tuberosity, sacrotuberous ligament
P: coccyx tip

Question 12

bituberous diameter

Answer 12

11cm

Question 13

outlet AP diameter

Answer 13

9.5-11.5cm

Question 14

outlet posterior sagittal diameter

Answer 14

> 7cm

Question 15

outlet transverse diameter

Answer 15

11cm

Question 16

caldwell-molloy classification: type of pelvis

Answer 16

posterior segment

Question 17

caldwell-molloy classification: tendency

Answer 17

anterior segment

Question 18

round;
AP equal & spacious;
well curved (90) sacrum, backwards;
wide & shallow sacrosciatic notch;
divergent sidewalls;
curved pubic arch:
wide subpubic angle
N bituberous angle

Answer 18

gynecoid

Question 19

AP oval;
AP inc. w/ A narrowing;
long & narrow (90) sacrum, posterior;
more wide & shallow sacrosciatic notch;
divergent sidewalls;
long & curved pubic arch:
slightly narrow subpubic angle
N/short bituberous angle

Answer 19

anthropoid

Question 20

triangular;
P short w/ A narrowing;
straught (<90) sacrum, forward;
narrow & deep sacrosciatic notch;
convergent sidewalls;
long & straight pubic arch:
narrow subpubic angle
short bituberous angle

Answer 20

android

Question 21

transverse oval;
AP reduced & flat;
(>90) sacrum, posterior;
slightly narrow & small sacrosciatic notch;
divergent sidewalls;
short & curved pubic arch:
very wide subpubic angle
wide bituberous angle

Answer 21

platypelloid

Question 22

anterior fontanel

Answer 22

bregma

Question 23

posterior fontanel

Answer 23

lambda

Question 24

biparietal diameter

Answer 24

9.5cm

Question 25

supra-occipitomental diameter

Answer 25

13.5cm

Question 26

submentobregmatic diameter

Answer 26

9.5cm

Question 27

sub-occipitobregmatic diameter

Answer 27

9.5cm

Question 28

occipitofrontal diameter

Answer 28

11cm

Question 29

min. req. of interspinous diameter?

Answer 29

> 10cm

Question 30

presenting part?
vertex
sinciput
brow
face

Answer 30

vertex - sub-occipitobregmatic
sinciput - sub-occipitofrontal
brow - sub-occipitomental
face - submentobregmatic

Question 31

most common fetal head position

Answer 31

OA / OT

Question 32

assess adequacy of pelvis for vaginal delivery?

Answer 32

trial of labor