Bony pelvis Flashcards
Bony pelvis is made up of
2 hip bones: anterior and laterally.
Sacrum and coccyx: posteriorly.
The 2 hip bones articulate in the midline anteriorly by
pubic symphysis
The hip bone articulates posteriorly with the sacrum by
sacroiliac joint
Pubic symphysis is what type of joint
Sacroiliac joint is what type of joint
symphyses-secondary cartilaginous
synovial joint- plane
Divisions of the pelvis
Greater or false pelvis
Lesser or true pelvis
Greater pelvis
Bounded by iliac fossa on each side.
Cavity forms lower part of abdominal cavity.
Lesser pelvis
Lies below level of pelvic brim.
It is the space enclosed between the pelvic inlet and outlet.
The junction between the greater and lesser pelvis is known as
Pelvic inlet.
The outer bony edges of the pelvic inlet
Pelvic brim
Borders of pelvic inlet
Posterior – sacral promontory and sacral wings or ala.
Lateral – arcuate line on the inner surface of the ilium, and the pectineal line on the superior pubic ramus.
Anterior – pubic symphysis.
What determines size of birth canal
Pelvic inlet.
Where is the pelvic outlet located
At the end of the lesser pelvis and at the beginning of the pelvic wall
Boundaries of pelvic outlet
Posterior: The tip of the coccyx
Lateral: The ischial tuberosities and the sacrotuberous ligament
Anterior: The pubic arch
The angle beneath the pubic arch is known as
Sub-pubic angle
Greater size in women.
Boundaries of lesser pelvis
Anterior and below- pubic symphysis, body of pubis and pubic rami.
Posterior and above-pelvic surface of sacrum and coccyx.
On each side-pelvic surface of ilium and ischium.
