THE HEAD AND NECK 



1115 



crossed by the posterior belly of the digastric and stylo-hycid 

 muscles, and the hypoglossal nerve. Thereafter the vessel is em- 

 bedded in the substance of the parotid gland, where it is crossed 

 from behind forwards by the facial nerve. 



Relations — Anterior. — ^The skin ; superficial fascia ; platysma 

 myoides ; deep fascia ; anterior border of the stemo-cleido-mastoid ; 

 the lingual and common facial veins ; the hypoglossal nerve (all 

 the foregoing being anterior relations, whilst the artery lies in the 

 superior carotid triangle) ; the posterior belly of the digastric and 

 stylo-hyoid muscles ; the greater part of the parotid gland ; the 

 temporo-maxillary vein ; and the facial nerve. Posterior. — ^The 



Transverse Facial 



Supraorbital 

 Frontal 



Angular 



■X „„ > „ . v^ . ... .>.-, . . .>.^^_^^__> -^ . ,- Lateral Nasal 



Superficial 

 Temporal 



Occipital - 



Internal Maxillary 

 Posterior Auricular 



— Superior 

 Coronary 



Inferior 

 Cornnary 



T, Inferior Labial 



Occipital ,■ 

 Internal Carotid' 



~" Submental 

 Submaxillary Gland 



Eternal Carotid 



Facial 



Lingual 

 Superior Thyroid 



Fig. 455. — The Arteries of the Right Side of the Head (after 

 L. Testut's ' Anatomie Humaine '). 



chief posterior relations are as follows : (i) the stylo-pharyngeus 

 muscle, glosso-pharyngeal nerve, and styloid process of the tem- 

 poral bone, all of which intervene between the vessel and the in- 

 ternal carotid (the latter now lying behind the external carotid) ; 

 and (2) a small portion of the parotid gland. External. — The 

 internal carotid artery for a short distance. Internal. — ^The 

 pharynx and hyoid bone ; the superior laryngeal nerve ; a portion 

 of the parotid gland ; and the posterior border of the ramus of the 

 inferior maxilla. 



The external carotid artery has no vein in the sense of a com- 



