-
3 bones and 3 joints of the pelvis
- bones: 2 innominates and a sacrum
- joints: 2 SI jts and the pubic symphysis
-
iliac bone's surface where it interacts with the sacrum
- crescent shaped
- concave posterosup, and around the rim, except inf -- it's an upside down horse-shoe of concavity
- a crest btwn 2 furrows
-
ilium and sacrum, which has the thicker end plate?
ilium, with lots of proteoglycans with collagen making up the fibrocartilage covering the joint
-
shape of sacrum where it interacts w iliac
corresponds to iliac... has a furrow bordered by 2 crests
-
how does the hyaline cartilage compare, sacrum to iliac?
it's 2-3x thicker on the sacrum (this asymmetry isn't seen anywhere else)
-
inguinal lig attachments
pubic tubercle --> ASIS
-
iliolumbar lig attachments
- TP of L4-5 to the iliac crest's inner lip on the
- posterior side
- only in bipedal animals
- not present in humans until 2nd decade of life
- thought to dev from a sprig of QL
-
iliolumbar lig blends with what lig?
anterior SI lig
-
which pelvic lig pulls the lumbar spine into rot and how?
iliolumbar lig -- it runs from iliac crest to L4-5 TPs, so if the innominate goes into post tilt it pulls on the lig which pulls on the spine
-
sacrospinous lig attachments
- ischial spine --> lateral region sacrum and coccyx
- deep (ant) to sacrotub lig,
-
- shares fiber space with sacrotub ligament.
-
sacrospinous lig roll
- works with sacrotuberous ligament to stop ilium rotation while allowing posterior rotation.
- They're most notably stressed when a person leans forward or stands up.
This pair of ligaments converts the greater and lesser sciatic notches into the greater and lesser sciatic foramens.
-
sacrotuberous ligament attachments
- sacrum (TPs down to upper coccyx)--> ischial tub
- (remember, the hammies attach to ITs, so there's a rel w/biceps femoris)
-
ant SI lig attachments and description
anterior surface of the lateral part of the sacrum --> margin of the auricular surface of the ilium and to the preauricular sulcus
- ant to SI jt
- relatively thin
- flat
- described as a sling holding the front of the sacrum
- CAN be injured and cause pain, but hard to diagnose bc can't be palpated
-
posterior sacroliliac lig
about the layers...
- short interosseous lig: deepest, most horizontal
- intermediate: takes up most space, running from the post arch of sacrum to mid-ilium, overlying most of the posterior part of the joint (superolat)
- long posterior SI lig: from 3rd transverse tubercle of sacrum to the PSIS, has more vertical fibers, adding stability to the joint
-
what kind of joint is the pubic symphysis?
secondary cartilagionous joint, amphiarthrosis
-
ligament connecting the pubic symp, and what's in it?
interosseous lig (ant, post, and sup ligs), with a fibrocartilagionous disc in the middle
-
what happens on each of the 3 horiz axes of the sacrum
- sup (by the base) -- respiratory tipping
- middle -- nutation (top tips ant) and counternutation
- inf - flex/ext ??
-
sacrum functions as an atypical ___
lumbar vert
-
SI jts function as atypical ___
facet joints
-
the innominate is functionally considered UE or LE?
LE
-
ILA - what is it?
inferior lateral angle -- the lateral dips at the bottom of the sacrum -- they're like atypical TPs
-
iliopsoas attachments
bodies of T12-L3 (psoas) + inner iliac crest (iliacus) --> lesser troch
-
QL attachments
last rib and TPs of lumbar vert -->iliac crest and iliolumbar lig
(T12-L4 nerves)
|
|
