Spinal Joints Flashcards
What joint class is the atlanto-occipital joint?
Condylar
What bones are involved at the atlanto-occipital joint?
Condyles of the occiputSuperior articular facet of C1
What is the range of motion at the atlanto-occipital joint?
Flexion, extension, minor lateral bend and rotation
What acts on flexion of the atlanto-occipital joint?
Longus capitis and rectus anterior
What muscles act in extension of the atlanto-occipital joint?
SCM, semispinalis, splenius
What acts in lateral bending of the atlanto-occipital joint?
Rectus lateralis, SCM, trapezius
What innervates the atlanto-occipital joint?
C1
What class of joint is the median atlanto-dental joint?
Pivot/trochoid
What bones are involved at the median atlanto-dental joint?
Anterior arch of C1 and Dens of C2
What type of motion(s) occur at the median atlanto-dental joint?
Rotation
What muscles act in rotation of the median atlanto-dental joint?
SCM, semispinalis capitis against rectus capitis posterior major, obliquus capitis superior and inferior
What is the innervation of the median atlanto-dental joint?
C2
What is joint classification of the lateral atlanto-axial joint?
Planar
What bones are involved in the lateral atlanto-axial joint?
Lateral masses of C1 and the superior articular facets of C2
What motions are possible at the lateral atlanto-axial joint?
Rotation and flexion/extension
What muscles act in rotation of the lateral atlanto-axial joint?
SCM, SS capitis against rectus capitis posterior major, obliquus capitis superior and inferior
What is the innervation of the lateral atlanto-axial joint?
C2
What joint classification is the zygapophyseal joint?
Planar
What bones are involved in the zygapophyseal joint?
Inferior articular facet of the superior vertebraSuperior articular facet of the inferior vertebra
What is the orientation of the superior facets?
Cervicals - posterior, superior, medialThoracic - Posterior, superior, lateralLumbar - Posterior, medialL5 - Posterior
What is the facet orientation in the coronal plane for each region?
C - 0 degreesT - 15 degreesL 90 degrees
What is the facet orientation in the sagittal plane for each region?
C - 90 degreesT - 75 degrees L - 0 degrees
What is the facet orientation in the horizontal plane for each region?
C - 45 degreesT - 60 degreesL - 90 degrees