192 



THE ARTICULATIONS AND LIGAMENTS OF THE HEAD 



Jugular eminence 



Tuberculum jugulare^ 

 Posterior condylar foramen 

 Canalis hypoglossi \ 



Occipito-atlantal synovial joint 



Articulatio atlanto-occipitalis , 



Synovial cavity between the odon- 

 toid process and the transverse 



ligament of the atlas 

 Atlanto-axial synovial joint 



Articulatio atlanto-epistrophica 



Basilar portion of the occipital bone 



. 1'ars basilaris ossis occipitalis 



Middle odontoid ligament or 

 suspensory ligament of the axis 



Lig. ap'cis dentis 



,. Lateral or alar odontoid 

 or check ligament 

 Lig. alare 



Lateral mass of the atlas 



Massa lateralis atlantis 



-- Transverse ligament of the atlas 

 Lig. transversum atlantis 



_ p V, 



Odontoid process Deus ep;strophei 



FlG. 421. OCCIPITO-ATLANTAL AND ATLANTO-AXIAL ARTICULATIONS IN FRONTAL SECTION. 

 LATERAL OR ALAR ODONTOID OR CHECK LIGAMENTS AND MIDDLE ODONTOID LIGAMENT OR 

 SUSPENSORY LIGAMENT OF THE Axis. 



The section passes through the middle of the posterior condylar forr.mina; and divides the summit of 

 the antero-posterior curve of the occipital condyles. 



I Occipitosphenoidal synchondrosis Synchondrosis spheno-occipitalis 

 Cranial dura mater 

 Dura mater encephali 



Transverse or basilar sinus, or basilar plexus 

 I Plexus basilaris 



Superficial expansion of the lateral or alar odontoid or check ligaments 



IBursa at the summit of the odontoid process Bursa apicis dentis 

 I 'Upper vertebral limb of the cruciform ligament of the axis 



, Posterior or long occipito-axial ligament 1 -Membrana tectoria 

 Vertebral artery 



Arteri 



Middle odontoid ligament or sus 

 pensory ligament of the axis 



Lig. apicis dentis 

 Anterior occipito-atlantal ligament 



Membrana atlanto-occipitalis 

 anterior 



R tS f "" 



Odonto-atlantal synovial joint 



Articulatio atlanto-epistrophica"" 



Anterior arch of the atlas--^ 

 Arcus anterior atlantis 



Anterior articular facet of odontoid pro 

 ceBS Facies articularis anterior dentis 



Posterior articular facet of the odontoid 

 process (groove for the transverse 



ligament) 



Facies articularis posterior dentis 

 Lower vertical limb of the cruciform ' 



ligament of the atlas /' 



Insertion of the posterior or long occipito-' 

 axial ligament into the body of the axis 



Posterior common ligament 

 Lig. longitudinale postering 



Cranial 



Squamous portion of the 

 occipital bone 



Squama occipitalis 



mater 



Dura mater encephali 



Posterior occipito-atlantal ligament 



Membrana atlanto-occipitalis posterior 



Posterior arch of the atlas 

 Arcus posterior atlantis 



Posterio- atlanto-axial ligament 

 Membraiia atlanto-epistrophica 

 Transverse ligament of the atlas 

 Lig. transversum atlantis 

 Spinous process of the axis 

 1'rocessus spinosus epistrophei 

 Lig. subflavum -Lit;, flavum 

 Spinal dura mater 

 Unra mater spinalis 



See note to p. 177. 



FIG. 422. ARTICULATIONS AND LIGAMENTS OF THE ODONTOID PROCESS. STRATIFORM ARRANGE- 

 MENT OF THE CRUCIFORM LIGAMENT OF THE ATLAS, THE POSTERIOR OR LONG OCCIPITO- 

 AXIAL LIGAMENT, AND THE DURA MATER. SPHENO-OCCIPITAL SYNCHONDROSIS. (MEDIAN 

 SECTION THROUGH THE POSTERIOR PORTION OF THE BASE OF THE CRANIUM AND THE 

 THREE UPPERMOST CERVICAL VERTEBRAE.) 



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



articulations. 



