cervical anatomy and biomechanics Flashcards
(14 cards)
what do the alar ligaments do?
contributes to coupling behavior bet C1 and C2
what is the role of the longus capitis and longus colli?
cervical flexors, small moment arm, stabilizers
where does 50% of axial rotation occur in the neck?
at c1/c2
what happens in cervical flexion?
upper segment rotates anteriorly, slides forward. IV foramen and spinal canal widen, post elements under stress
what happens in lateral bending?
ippsilateral compression, IV foramen narrowed ipsilaterally and opened contralaterally, coupled with axial rotation
what happens in axial rotaiton?
ipsilateral compression, iv foramen narrowed ispilaterally, coupled with lateral bending, 50% at C1/C2
what is the role of the facet joint?
guide and limit movement of the spinal motion segment
what is the role of the posterior longitudinal ligament?
Limits flexion of the vertebral column and reinforces the intervertebral disc
role of anterior longitudinal ligament?
Limit extension of the vertebral column and reinforce the intervertebral disc.
role of ligamentum flavum
upright posture
assist the vertebral column in resuming it’s shape after flexion.
resists excessive separation of the adjacent vertebral lamina
prevents buckling of the ligament into the spinal canal during extension, preventing canal compression.
lateral portion of the ligament prevents the anterior capsule of the facet joint being nipped within the joint cavity during movement.
role of interspinous ligament in cervical spine?
limit flexion through restricting separation of the spinous processes of the vertebral column.
role of facet capsules?
stabilize the vertebral column
role of nuchal ligaments?
Limits flexion
Provides an attachment for Trapezius and Splenius capitis.
what is the movement of the upper trapezius?
lateral flexion to same side
rotation to opposite side
extension (b)
