ARTICULATIONS OF THE HEAD WITH THE NECK 



269 



Fig. 351. The Occipito-Atloid and Atlo-Axoid Articulations 

 A A, Posterior portion of skull. BB, Atlas, cc, Axis or Dentata. 



I. Vertical section through the occiput, atlas, and axis. (The occiput is drawn apart from the atlas in order 

 to show the articular cavity of the latter bone.) 1, The occipital bone. 2, Its basilar process. 3, Occipital con- 

 clyle. 4, Superior arch of the atlas. 5, Its inferior tubercle. 6, Articular cavity (shown viewed in front at 3, 

 Fig. 2, Plato XXXVIH). 7, Spinal canal. 8, Odontoid process of the axis. 9, Its superior spinous process. 

 10, Its inferior spinous process. 11, Spinal canal. 



II. Vertical section through the same bones in their natural position, showing the ligaments. 12, Superior 

 occipito-atloid ligament. 13, Inferior occipito-atloid ligament. 14, Superior atlo-axoid ligament. 15, Inferior 

 atlo-axoid ligament. 16, Odontoid ligament. 17, Spinal canal, with the dura mater in position. (The spinal cord 

 has been removed.) 



