Pelvis Flashcards
Function of Pelvis
- supports the weight of the body
- supports and protects viscera
- provides attachment for muscles
- bony birth canal in females
Female pelvis shape
- adapted for childbearing
- true pelvis (inferior to pelvic brim) defines birth canal
- cavity of true pelvis is broad, shallow, and has greater capacity
Male Pelvis shape
- tilted less far forward
- adapted for support of male’s heavier build and stronger muscles
- cavity of true pelvis is narrow and deep
The joints of the pelvic girdle
- right and left sacroiliac joints (posterolaterally)
- symphysis pubis (anteriorly) or pubic symphysis
- Lumbosacral joint (superiorly)
Sacroiliac ligaments
- short sacroiliac ligaments: composed of horizontal fibers extending from the sacrum to the posterior part of the iliac bone
- long sacroiliac ligaments: composed of fibers extending vertically from the sacrum to the posterior superior iliac spine
Pubic symphysis
body, superior rami, inferior rami, obturator foramen
Forces on Pubic Symphysis
Compression
Shear & torsion
Cutting
Kicking
Lumbosacral joint
between the 5th lumbar vertebrae and sacrum
Lumbosacral and Iliolumbar ligaments
- Lumbosacral ligament is a thick, fibrous band that extends from the anterior, inferior aspect of the transverse process of L5 to the lateral surface of the sacrum
- Iliolumbar ligaments extend from the transverse processes of L4 to L5 to the iliac crest
Nerves of pelvis?
Spinal cord, Cauda equina, Sciatic nerve
Motion of the pelvis
- Right lateral pelvic tilt posture
- Left lateral pelvic tilt posture
- Anterior pelvic tilt
- Posterior pelvic tilt
Common pathologies for pelvis
-Pain from sciatica radiates from the buttock down the leg and can travel as far as to the feet and toes
Common pathologies for pelvis
- Pain from sciatica radiates from the buttock down the leg and can travel as far as to the feet and toes
- Dehydrated disc
- Lumbosacral arthritis
which 4 bones make up the pelvic girdle?
sacrum, coccyx, and 2 innominate bones
innominate bones (aka the hip bones or os coxae or Ala) are made up of the ilium, the ischium, and the pubis fused together into one bone
False pelvis
greater or major pelvis
- is the bone area between the iliac crests and superior to the pelvic inlet
- there are no pelvic organs within the false pelvis
True pelvis
lesser or minor pelvis
- lies between the pelvic inlet and the pelvic outlet
- the true pelvis area makes up the pelvic cavity
- contains portions of the GI tract, the urinary tract, and some reproductive organs
- In females, it makes up the birth canal
The pelvis doesn’t include the ____
femur
when people break their hip because they fell, it’s actually that they broke their hip and THEN fell
happens in osteoporetic older adults, they take a hard step off a curb or just a hard sit and they fracture it, so then they fall because of that break
What is another name for the sacral motion that is sometimes referred to as sacral flexion?
Nutation (occurs when the base of the sacrum (on the superior end) moves anteriorly and inferiorly) (look at pg 283)
SI joint motion
Nutation {sacral flexion}
Counternutation [sacral extension}
(look at pg 283)