THE ARTICULATIONS AND LIGAMENTS OF THE HEAD 

 Basilar groove Clivus I 



191 



Posterior condylar foramen 



Canalis hypoglossi \ 



Anterior condylar foramen 

 Canalis condvloidetis \ 



Lateral or alir odontoiJ 



or check ligament 



Lig. alare 



Transverse ligament of the atlas 

 (Horizontal portion of the cruci 

 form ligament of the atlas) 

 Lig. transversum atlantis 



Atlanto-axial synovial joint 



Articulatio atlanto- 

 epistrophica 



Cranial dura mater 

 Dura mater encephali 



Posterior or long occipito-axial ligament 1 



Membrana tectoria 



Upper vertical limb of the 

 - cruciform ligament of the 



atlas 



Capsule of the occipito-atlantal 

 articulation 



Accessory occipito-axial ligament- 



Cruciform ligament of the atlas 

 Lig. cruciatum atlantis 



Lower vertical limb of the cruci- 

 form ligament of the atlas 



FIG. 419. CRUCIFORM LIGAMENT OF THE ATLAS ; LATERAL OR ALAR ODONTOID OR CHECK LIGAMENTS 

 OCCIPITO-ATLANTAL AND ATLANTO-AXIAL SYNOVIAL JOINTS, THE RIGHT CLOSED, THE LEFT OPEN. 



The cranial dura mater and the posterior or long occipito-axial ligament 1 have been cut transversely 



in the basilar groove and turned upwards. 



1 See note to p. 177. 



2 Accessory occifiito-axial ligament. This ligament is. not mentioned by the author, though it is well shown in Fig. 41 

 ligament is a bundle of fibres strengthening the capsule of the occipito-atlantal joint at iu postero-internal angle. It rui 

 inwards from the back of the occipital condyle to the body of the axis near the base of the odontoid process. TR. 



9. The accessory 

 ns downwards and 



Basilar groove Clivus 



Posterior condylar foramen. 



Canalis hypoglossi 



Occipito-atlantal synovial joint 

 Articulatio atlanto-occipitalis 



Transverse ligament of the atlas 



Lig. transversum atlantis 



Atlanto-axial synovial joint 



Articulatio atlanto- 



epistrophica 



Jugular eminence 

 Tuberculum jugulare 



Middle odontoid ligament or 

 suspensory ligament of the axis 

 Lig. apicis dentis 



Lateral or alar odontoid or 



check ligament 



Lig. alare 



3ut surface of the neural arcli of the axis 



/ 



Posterior articular facet of the odontoid process (groove for tht ' 

 transverse ligament) Facies articularis posterior dentis 



FIG. 420. LATERAL OR ALAR ODONTOID OR CHECK LIGAMENTS. MIDDLE ODONTOID LIGAMENT 



OR SUSPENSORY LIGAMENT OF THE Axis. 



The transverse ligament of the atlas has been divided in the middle and the parts have been turned 

 outwards ; the dura mater and the posterior or long occipito-axial ligament have been entirely 

 removed. 



THE ATLAS AND THE Axis WITH THE ANTERIOR PORTION OF THE OCCIPITAL BONE SEEN FROM BEHIND, 

 A SECTION HAVING BEEN MADE SIMILAR TO THAT IN THE PREPARATION SHOWN IN FIG. 414. 



Articulationes atlanto-occipitalis et atlanto-epistrophica Occipito-atlantal and atlanto-axial 



articulations. 



