vertebral column 3 Flashcards
1
Q
Which muscles produce compressive forces on the lumbar motion segment?
A
multifidus - compresses spine and maintains lordosis
2
Q
Which muscles produce posterior shear forces on the lumbar motion segment? Is this a good or bad thing?
A
anything in the back that will cause ext/compression and small pars lumborum
good - don’t want anterior shear
3
Q
iliolumbar lig.
A
- stabilises L5 on S1
- resist anterior shear of L5 on S1 (and resirs mvmt in all directions (l5 on L1)
4
Q
uncinate process
A
guides mvmt of intervertebral motion segment
- limit lat. translation
- protect vertebral artery and spinal nerve from disc heriniation
5
Q
multifidus
A
most medial and thick
6
Q
deep > superficial
A
semispinalis on multifidus RMS r = 6 lvl m = 3 lvls s - 1-2 lvl
7
Q
spinalis
A
closest 2 spine
8
Q
pars thoracis
A
superficial
- attached to ESA
9
Q
pars lumborum
A
deeper yo ESA and attaches to PIC
10
Q
@ angle of ribs
A
iliocostalis thoracis
11
Q
TCF
A
on top > below ESA
