Spine Mechanics Flashcards
vertebral unit
two adjacent vertebrae
associated intervertebral disc
Rule of 3’s
refers to the location of the spinous process in relation to the transverse process in the thoracic spine
T1-T3
spinous process located at the level of the corresponding transverse process
*same level
T4-T6
spinous process located 1/2 a segment below the corresponding transverse process
T7-T10
spinous process located at the level of the TP of the vertebrae ONE below
T11
spinous process located 1/2 a segment below the corresponding transverse process
T12
Spinous process located at the level of the corresponding transverse process
*same level
Cervical Superior Facet Orientation
backward, upward, medial
BUM
Thoracic Superior Facet Orientation
backward, upward, lateral
BUL
Lumbar Superior Facet Orientation
backwards medial
Anterior Longitudinal Ligament
covers and connects the anteroalateral aspects of the vertebral bodies and IV discs
Posterior longitudinal ligament
weaker band that runs within the vertebral canal along the posterior aspect of vertebral bodies
- resists hyperflexion
- prevents posterior herniation of nucleus pulposus
Ligamentum Flava
connect the laminae of adjacent vertebrae
Rotatores
breves and longi
- bilateral: extend
- unilateral: rotates opposite
multifidus
found in lumbar region (skips 2-4 vertebrae)
- bilateral: extends the spine
- unilateral: flexes spine to the same side, rotates opposite
Semispinalis
- bilateral: extends thoracic and cervical spine
- unilateral: bends to same side, rotates opposite
Flexion
40-90 degrees
Extension
20-45 degrees
Sidebending
15-30 degrees
Rotation
3-18 degrees