C. Occipito-Axial Joint Flashcards
What ligaments are present at the occipito-axial joint?
the apical lig. of the dens/apicodental lig., alar lig. and membrana tectoria/ tectorial membrane
Embryologically, what forms the apical lig. of the dens or the apicodental lig.?
the notochord
What is the function of the apical lig. of the dens or the apicodental lig.?
it has no known function
What lig. attaches to the posterolateral part of the odontoid process of C2 and to surfaces on the medial border of the occipital condyle or as far anterior as the anterolateral margin of the foramen magnum?
the alar lig.
What is the function of the alar lig.?
together they function to resist axial rotation
What forms the cranial continuation of the posterior longitudinal lig?
the membrana tectoria or tectorial membrane
What are the attachment sites for the superfical laer of the membrana tectoria or tectorial membrane?
the posterior part of the inferior epiphyseal rim and vertebral body of C2 to the capsular lig. of the atlanto-occipital joint and cranial dura of the posterior crania fossa
What lig. is anterior to the dura mater of the medulla oblongat - spinal cord junction?
the membrana tectoria or tectorial membrane
What is the function of the membrane tectoria or tectorial membrane?
it resists flexion and extension of the skull on the upper cervical spine
List, in order, the ligaments in a midsagittal plane from the dura mater at the level of the medullar oblongata to the anterior bursa of the median atlanto-axial joint.
the membrana tectoria or tectorial membrane
the cruciate lig.
the capsular lig. of the posterior bursa of the median atlanto-axial joint
the apical lig. of the dens or the apicodental lig
For the cervical spine below C2, what is the range of motion allowed for each type of joint motion identified?
90 degrees flexion-extension, 50 degrees one side lateral bending and 33 degrees one side axial rotation
