THE ARTICULATIONS AND LIGAMENTS OF THE HEAD 



193 



Petrous portion of the temporal bone 

 v Pars petrosa ossis temporalis 



Dorsum sells 

 Dorsum sellae 



Pharyngeal tubercle 

 , Tuberculum pharyngeum 



Jugular foramen __ 

 Foramen jugulare XV'jj 



Mastoid process 



Processus mastoideus 



Sphenoidal sinus 

 Sinus sphenoidalis 



Petrobasilar syuchondrosis 



/ Synchondrosis 

 / petro-occipitalis 



Spinous process of 

 the sphenoid bone 



Spina angularis 



Tympanic plate 



s t >' m P an ' ca 



* Styloid process 



Processus styloideus 



Posterior condylar foramen 



Canalis hypoglossi 



Capsule of the occipito-atlantal,- 



synovial joint 



Capsula articulationis atlanto- 

 occipitalis 



\ 



\; Anterior occipito-atlantal ligament 

 Membrana atlanto-occipitalis anterior 



FIG. 423. ANTEP OR OCCIPITO-ATLANTAL LIGAMENT AND PETROBASILAR SYNCHONDROSIS. (THE 

 ATLAS WITH THE POSTERIOR PORTION OF THE BASE OF THE SKULL, SEEN FROM BEFORE.) 



External occipital protuberance 



Protuberantia occipitalis externa 



Posterior arch of the atlas , 

 Arcus posterior atlantis 



Squamous portion of 

 the occipital bone 



External occipital crest 

 Crista occipitalis externa 



Capsule of the occipito-atlantal 



synovial joint 



Capsula articulationis atlanto- 

 occipitalis 



Foramen for the passage of the 



vertebral artery and the 



suboccipital nerve 



V Posterior occipito-atlantal ligament 

 Membrana atlanto-occipitalis posterior 



FIG. 424. POSTERIOR OCCIPITO-ATLANTAL LIGAMENT. (THE ATLAS WITH THE OCCIPITAL BONE, 



SEEN FROM BEHIND.) 



Articulatio atlanto-occipitalis Occipito-atlantal articulation. 



2 5 



