General Spine Flashcards
Purpose of the spine
protection, stability, and mobility
Spines role in protection
houses and protects elements of the central to peripheral nervous system including the brainstem, spinal cord, spinal plexus, cauda equina, and nerve roots
spines role in stability
provides a rigid column for stability for head and extremity movement against multidirectional forces (tension, compression, bending, and twisting)
spines role in mobility
allows segmental, 3 dimensional motion directly within the rigid column when needed
Spinal regions
1) sub-cranial (OA, AA)
2) cervical -7
3) thoracic -12
4) lumbar - 5
5) sacral - 5 fused
6) coccyx
The spinal segment consists of
- adjacent halves of two vertebrae
-the disc
-the contents of the vertebral and interverbral foramen
-the facets (synovial joints)
-associated ligaments
-associated muscle, fascia, and integument innervated by the spinal nerve
Joints of the spinal segment
- A tripod design
- disk anteriorly
-Facet joints posteriorly
The disc contents
- annulus fibrosis
-nucleus pulpous
-vertebral end plates
Annulus fibrosis
fibro collagenous circular layers which are laid down perpendicular to one another
nucleus pulposis
centrally located proteoglycan rich gelatinous material
the facets are created by
- inferior articular process of superior vertebra
- superior articular process of inferior vertebrae
- thoracic spine has additional facets for articulation with ribs
when does the C spine develop lordosis
with the onset of the head lift
when does the L spine develop lordosis
with the onset of sitting
spinal curves in the frontal plane
should be symmetrical between left and right. Scoliosis is the lateral curvature in the frontal plane
saggital plane curves
- can get wedge fractures when disk is weak (leads to excessive kyphosis)
-lumbar lordosis
-cervical lordosis - lack of curvature