Ligaments of the Spine. 



59 



77. The Anterior Obturator Membrane, 

 Membrana obturatoria anterior. 



The space between the anterior arch of the atlas and the anterior 

 border of the Foramen magnum of the occipital bone is filled out by the 

 Membrana obturatoria anterior. In the figure the articulation between the 

 articular surfaces of the atlas and the axis and the capsular ligament 

 surrounding the articulation are shown as Art. 2; likewise the insertion 

 of the Ligamentum longitudinale anterius which in the region of the upper 

 cervical vertebrae is still roundish and narrow. 



