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Pelvic Girdle ch17

Lippert ch.17 - Pelvic Girdle Stucture - p.247-252

name the 4 bones that make up the pelvic girdle sacrum, coccyx, & 2 hip bones
name the 3 bones that make up the hip ilium, ischium, pubis
Where are the sacroiliac joints located? posterolaterally, between the sacrum and the left & right ilium bones
Where is the sypmphysis pubis located? anteriorly, between the left & right pubic bones
Where is the lumbosacral joint located? superiorly, between L5 & S1, where the spine meets the sacrum
What is the pelvic girdle also referred to as? the pelvis
How many planes does the pelvic girdle move in during walking? 3
What important function does the pelvic girdle provide during movement & posture? supports weight of vertebral column and passes force on to hips (also works conversely when foot contacts the ground)
false pelvis aka: greater or major pelvis; bony area between iliac crests & is superior to pelvic inlet
How many PELVIC organs are within the false pelvis? None
pelvic inlet line from sacral promontory posteriorly to superior boarder of symphysis pubis anteriorly
true pelvis aka: lesser or minor pelvis; area between pelvic inlet & pelvic outlet
pelvic outlet line from end of coccyx to inferior surface of pubic symphysis
pelvic cavity true pelvic area; contains portions of GI tract, urinary tract, some reproductive organs , & birth canal
How does the superior opening into the pelvic cavity differ between genders? male = heart shaped / female = oval
Which gender's pelvic cavity is longer and more funnel shaped? males
Which gender has a wider & more rounded pelvic arch? females
Which gender has their acetabula & ischial tuberosities further apart? females
What type of joint is the sacroiliac joint? synovial, nonaxial, plane joint with irregular surfaces
Is the sacroiliac joint very stable? yes
Is the sacroiliac joint very mobile? no
What is a synovial joint's articular surface lined with? hyaline cartilage
nutation aka: sacral flexion; base (top) of sacrum moves anteriorly & inferiorly, coccyx moves posteriorly
counternutation aka: sacral extension; base (top) of sacrum moves posteriorly & superiorly, coccyx moves anteriorly
Does the PELVIC INLET become larger during nutation or counternutation? counternutation
Does the PELVIC OUTLET become larger during nutation or counternutation? nutation
What motions must happen to allow for nutation? trunk flexion or hip extension
What motions must happen to allow for counternutation? trunk extension or hip flexion
Which occurs 1st during childbirth: nutation or counternutation? early labor = counternutation / later stages of labor = nutation
How many fused vertebrae make up the sacrum? 5
Is the anterior surface (or pelvic surface)of the sacrum convex or concave? concave
What is the name of the ridge projecting along the anterior edge of the body of S1 on the sacrum? promontory
What is the name of the lateral flared wings of the sacrum that are actually fused transverse processes? ala
Name the bony landmark that is shaped similar to the external ear & is located on the lateral surface of the sacrum. auricular surface
What is the superior surface of S1 called? the BASE of the sacrum
What bony landmark serves as an exit for the anterior & posterior divisions of sacral nerves? foramina
Where is the superior articular process of the sacrum located? posteriorly on base; articulates with inferior articular process of L5
What part of the hip bone does the ilium make up? the superior part of the hip
iliac tuberosity large, roughened area, posterior, between iliac crest & articular surface (where interosseous ligament attaches)
auricular surface of the ilium earlike shape, where ilium articulates with sacrum
iliac crest superior ridge of ilium
Posterior Superior Iliac Spine (PSIS) posterior projection of iliac crest, where posterior sacroiliac ligaments attach
Posterior Inferior Iliac Spine (PIIS) inferior to PSIS, where sacrotuberous ligament attaches
greater sciatic notch formed by ilium superiorly & the ilium & ischium inferiorly
greater sciatic foramen sciatic nerve passes through this opening
ischium inferior to ilium & posterior to pubis
ischial body all of ischium that is superior to ischial tuberosity
lesser sciatic notch inferior to greater sciatic notch; just below ischial spine, but above the ischial tuberosity
ischial spine between greater & lesser sciatic notches; provides attachment for sacrospinous ligament
ischial tuberosity blunt, rough projection on the inferior part of the body; bears weight while sitting
Why does the sacroiliac joint have so many ligaments? to absorb lots of stress while providing great stability
pubic symphysis joint fibrocartilage disk at midline between right & left pubic bones (amphiarthrodial joint = little movement)
Where is the pubis located in the hip? inferior to ilium, anterior to ischium
pubic body between superior & inferior rami
pubic tubercle projection anteriorly off superior pubic ramus, where superior pubic ligament attaches
superior pubic rami superior projection of pubic body
inferior pubic rami inferior projection of pubic body, where inferior pubic ligament attaches
Created by: jteich



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