Lumbar Flashcards
Vertebral body shape
kidney shaped
Features of the pedicles (sup/inf notch, allignment)
- broad, sterdy
- small sup notch, wider inf notch
- aligned in parasagittal plane
Laminae features
- broad, large
- well defined region iterspoe bw the sup articular process and inf art process (pars interarticularis)
TVP features
- aligned in transverse plane
- longer than thoracic
Sup articular process (shape, orientation)
- articular surface is concave
- medial + post
Non articular surface has mammilary process
Inf articular process (shape, orientation)
- Descend below the level of VB
- articular surface convex
- lat +ant
SP features
rectangular, sturdy, horizontaly placed in the midsagittal plane
Lumbar IVF size and orientation
biggest (pear shape)
lateral orientation
Borders of lumbar IVF
Ant-Posteriolateral part of vertebrae body and IVD
Inf- Sup notch
Post- z joint
Sup- inf vert notch
Content of lumbar IVF
Spinal nerve in the top 1/3
IVF of L5-S1 borders
ant- base of TP L5, posteriolateral part of L5 and IVD
inf- posterio medial part of ala of sacrum
post- z joint l5-s1
sup- inf vertebral notch
content of IVF of L5-S1
thick nerve through narrow oppening occupys 1/2- in postlateral herniation L5 will become compressed
Biomechanics of lumbar spine
Rot- the least (due to articular facet orientation)
lateral flex- fair
flex/extend- the most
At what level does the spinal cord end
L2
In a posterolateral herniation of IVD L4/5 what nerves will b affected
L4 will be spared but nerves that pass to lower levels will be compressed
