13.1 Pelvic Cavity: Males vs Females and measurements Flashcards
shallow false pelvis
female
deep false pelvis
male
oval pelvic inlrt
female
heart-shaped pelvic inlet
male
bigger pelvic cavity
female
larger pelvic outlet
female
shorter, wider, flatter
sacrum
female
larger, thinner, curved sacrum
male
rounded and wider pubic arch
female
The distance between the ischium bones is small
males
pelvis is larger and broader
female
taller (owing to a higher iliac crest), narrower, and more compact pelvis
male
angle between the inferior pubic rami is acute (70º)
male
angle between the inferior pubic rami is obtuse (90-100º)
female
greater sciatic notch is wider
females
ischial spines and tuberosities are heavier and project farther into the pelvic cavity
males
sacrum is long, narrow, straighter, and has a pronounced sacral promontory
male
shorter, wider, more curved posteriorly, and has a less pronounced promontory
female
acetabula are wider apart and face more medially
females
measurements of the inlet
- true conjugate diameter
2 diagonal conjugate diameter
measurements of the outlet
- transverse diameter
2. interspinous diameter
measurement from the sacral promontory to the superior margin of the pubis symphysis
true conjugate diameter
measurement from the sacral promontory to the inferior margin of pubic symphysis; measured during obstetric examination
diagonal conjugate diameter
distance between ischial tuberosities
transverse diameter
distance between ischial spines
interspinous diameter
if interspinous diameter is < _____ cm if may present as barrier to fetus during childbirth
<9.5 cm
typical type of pelvis
41%
gynecoid
male or funnel shaped pelvis with contracted outlet
33%
android
long , narrow, oval shaped pelvis
24%
anthropoid
wide pelvis flattened at the brim with the promontory of the sacrum pushed forward
2%
platypelloid