OCCIPITO-YEETEBIIAL AETICULATIOXS. 



139 



The lateral or alar odontoid ligaments are two thick and very 

 strong- bundles of fibres, which extend from the sides of the summit of the 

 odontoid process outwards and a little upwards to be implanted into the 

 rough depression on the inner side of 

 each condyle of the occipital bone, and Fig. 1-24. 



into a small part of the margin of the 

 foramen magnum. Some of the fibres 

 of the two ligaments are continuous across 

 the middle line. 



Fig. 124. — Transverse Section similar to 



THAT REPRESENTED IN" FiG. 122, THE CRUCI- 

 FORM Ligaments uaving been removed. (A. 



T.) 



4, alar odontoid ligament ; 5, accessory atlanto- 

 axial ligawent ; <3, 7, capsular ligaments of the 

 occipito-atlautal and the atlanto-axial articulations ; 

 9, head of the odontoid process ; 9, 9', middle 

 odontoid ligament. 



Fig. 125. 



Fig. 125. — The Ligamentous Structures which surround the Articulations op 

 THE Occiput and two Upper Vertebr.e. i 



A, the lower part of the skull sawn transversely through the basilar process, with the 

 atlas and axis, viewed from before. 1, the anterior occipito-atlantal ligament ; 2, the 

 accessory occipito-atlantal ligament ; 3, the anterior atlanto-axial ligament. 



]], the lower part of the skull, with three adjacent vertebrre, viewed from behind. 1, 

 the^posterior occipito-atlantal ligament ; 2, the posterior atlanto-axial ligament. 



C, the occipital bone sawn transversely through the foramen magnum, and a part of the 

 arches of the atlas and axis removed posteriorly, so as to show the apparatus ligamentosus. 



