3 o8 



HEAD AND NECK 



superficial to the nerve. At a slightly lower level it is con- 

 cealed by the lower part of the postero-medial surface of the 

 parotid, and it is crossed by the sterno-mastoid branch of the 

 occipital artery. After it emerges from under cover of the 

 parotid, it lies under cover of the anterior border of the 

 sterno-mastoid, except in the region of the upper part of the 

 carotid triangle, where it may project anteriorly, beyond the 

 anterior border of the muscle, for a short distance. It is 

 separated from the sterno-mastoid by numerous deep cervical 

 lymph glands ; and under cover of the muscle it is crossed 

 superficially, at the level of the upper part of the thyreoid 



Sheath of dura mater 



around vagus and 



accessory nerves 



Ganglion nodosum 



Internal jugular vein 



Superior laryngeal nerve 



Accessory nerve 



Vagus nerve 



Sheath of dura mater around 

 glosso-pharyngeal nerve 



Inferior petrosal sinus 

 Internal carotid artery 



Glosso-pharyngeal nerve 



Pharyngeal branch of 

 vagus 



Internal laryngeal nerve 

 External laryngeal nerve 



FIG. 124. Diagram of the relation of parts in the 

 Jugular Foramen. 



cartilage, by the communicans cervicalis from the cervical 

 plexus, and, at the level of the cricoid cartilage, by the 

 intermediate tendon of the omo-hyoid, the sterno-mastoid 

 branch of the superior thyreoid artery and the nerve to the 

 posterior belly of the omo-hyoid. Below the omo-hyoid it 

 is covered by the posterior border of the sterno-hyoid, and is 

 crossed by the anterior jugular vein ; and at its termination 

 it lies posterior to the sternal end of the clavicle. 



Posteriorly, it is in relation with the rectus capitis lateralis ; 

 the rectus capitis anterior (O.T. anticus minor) ; and the loop 

 between the first and second cervical nerves. At a lower 

 level its posterior relations are the transverse processes of the 

 cervical vertebrae and the muscles attached to their anterior 

 tubercles, viz., the longus capitis (O.T. rectus capitis anticus 



