![]() ![]() The left and right lateral atlantoaxial joints are the articulations between the inferior articular surface of the lateral mass of atlas (C1) and the superior articular surface of the lateral mass of axis (C2). This article will discuss the anatomy and function of the atlantoaxial joint. Limited flexion, extension, lateral flexion Ventral primary ramus of the second cervical spinal nerveĭeep cervical, occipital, vertebral arteries Lateral atlantoaxial joints: inferior articular surface of lateral mass for atlas, superior articular facet of axisĬruciform ligament (transverse ligament of atlas, superior and inferior longitudinal bands), tectorial membrane, alar ligaments, apical ligament of dens Median atlantoaxial joint: dens of axis (C2), osteoligamentous ring (anterior arch of atlas, transverse ligament of atlas) ![]() Key facts about the atlantoaxial joint TypeĪtlantoaxial joint complex: Synovial joint biaxial This is also the movement that allows us to shake our head in the familiar ‘no’ pattern. This movement allows us to turn our head to look towards the left or towards the right. In rotation the atlas together with the head, rotate around the dens of axis. The primary movement of the atlantoaxial joint complex is rotation. These joints are classified as gliding, or plane joints. The lateral atlantoaxial joints are bilateral joints formed between the lateral masses of the atlas and axis. ![]() The median atlantoaxial joint is formed between the dens of axis and an osteoligamentous ring of the atlas anteriorly and transverse ligament posteriorly. It is composed of three synovial joints one median atlantoaxial joint and two lateral atlantoaxial joints. The atlantoaxial joint is a complex joint between the atlas (C1) and the axis (C2). Lateral atlantoaxial joint (Articulatio atlantoaxialis lateralis) ![]()
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