6o 



A MANUAL OF ANATOMY 



directed forwards and inwards, and the direction of each surface 

 is downwards and slightly outwards. They do not extend farther 

 back on the lateral margins of the foramen magnum than the level 

 of the centre, and the front part of each belongs to the basilar portion. 

 The circumference of a condyle gives attachment to the capsular 

 ligament of the corresponding occipito-atlantal joint, and on the 

 inner aspect of each there is a tubercle for the lateral odontoid or 

 check ligament. External to the front of each condyle is the 



Superior Angle 



Depression for Torcular Herophili 



Superior Lateral 

 Bortler 



Groove for Superior Longitudinal 

 Sinus 



Cerebral Fossa 



^.Internal 

 '' Occipital 

 Protuberance 



Lateral Angle 



Inferior Lateral 

 Border 



Posterior Condylar >- 

 Foramen 



Cerebellar Fossa 



-Vermiform Fossa 



.,Groove for Lateral 

 Sinus 



•'Jugular Process 



Jugular Notch 



Basilar Groove 



Basilar Process 



Fig. 40. — The Occipital Bone (Internal View). 



anterior condylar foramen, which opens forwards and outwards from 

 the cranial cavity. It transmits the hypoglossal nerve and a 

 meningeal branch of the ascending pharyngeal artery. Behind 

 each condyle is the posterior condylar fossa, which may be pierced 

 by a posterior condylar foramen, on one or both sides, for an 

 emissary vein passing between the intracranial lateral sinus and 

 the extracranial suboccipital venous plexus. The part external 

 to the condyle is called the jugular process, which lies above the 



