Cervical Anatomy 3 Flashcards
What happens to the contact area of the facet joint during flexion?
- superior segment glides sup/ant on inf segment
- slides up and tilts slightly forward
- contact area of joint is decreased
What happens to the IVF diameter in flexion?
increased
clinical implication of decreased contact area with flexion
load is being supported on a smaller surface » increasing joint compression
What happens to the contact area of the facet joint during extension?
- superior segment glides inf/post
- contact is maximal and loadbearing
What happens to the IVF diameter in extension?
decreases
In the forward head position (FHP), the upper cervical spine is in a(n) (flexed/extended) position, while the lower cervical spine is in a(n) (flexed/extended) position.
- upper: extended
- lower: flexed
What happens to upper/lower regions with protraction?
- lower/mid flexes
- upper extends
During lateral flexion, the ipsilateral facets:
approximate
During lateral flexion, the contralateral facets:
distract
Describe ALL/PLL in c-spine
ALL: narrow
PLL: wide
Why is the PLL wider in c-spine than lumbar?
- PLL doing more in C-spine to keep head upright
- have more flexion in c-spine (stops when chin hits chest) and need more help to “check” it
- SC larger in C-spine, so PLL protects from posterior protrusions
Why does the ALL not need to be as strong as the PLL in the C-spine?
- spinous processes limit c-spine extension
- ALL doesn’t need to be as strong
B contraction of SCM causes these motions
- flexion
- protraction
SCM is mostly responsible for protraction in this position
standing
SCM contributes to this postural deviation
- FHP
- will get tight if someone maintains for a long time