12 HUMAN ANATOMY. 



The foramen magnum, transmitting the medulla oblongata 

 and its coverings, the vertebral arteries, and the spinal accessory 

 nerves. 



A little in front and on either side of the foramen magnum 

 are the condyles for articulation with the atlas, the inner border 

 of each condyle presenting & tubercle for the check ligament. 



Externally to each condyle are the jugular processes, afford- 

 ing attachment for the rectus capitis lateralis, and forming by its 

 articulation with the fibrous portion of the temporal bone the 

 jugular foramen, or foramen lacerum posterius, transmitting the 

 internal jugular vein, glosso-pharyngeal, pneumogastric, and 



FIG. 6. 



1, cerebral fossa; 2, cerebellar fossa; 3, superior longitudinal 

 sinus; 4, occipital sinuses; 5, lateral sinus; 6, torcular Herophili; 

 7, foramen magnum; 8, jugular process; 9, posterior condyloid fora- 

 men; 13, jugular fossa; 14, inferior petrosal sinus. 



spinal accessory nerves, and meningeal branches of the ascending 

 pharyngeal and occipital arteries. 



In front of the condyles on either side are the openings of 

 the anterior condyloid foramen, for passage of hypoglossal nerve 

 and meningeal branch from the ascending pharyngeal artery; 

 and behind, the posterior condyloid foramen, for passage of a 

 small vein to the lateral sinus. 



In front of the foramen magnum is the lasilar process, 

 articulating with the sphenoid bone, and grooved on its under 

 surface by the pharyngeal spine for the insertion of the tendinous 

 raphe and superior constrictor of the pharynx. 



