THE NECK, ANTERIOR. 83 



locate the relative positions of these boundaries without 

 further particulars.) 



Its floor is formed by the anterior belly of the digastric, 

 the mylohyoid, the hyoglossus, the styloglossus, superior 

 constrictor, and the stylopharyngeus muscles. 



Within it are found arteries, internal and external caro- 

 tids, facial, and its cervical branches. 



Veins : Internal jugular, facial, anterior and posterior 

 divisions of the temporomaxillary vein or sinus. 



Nerves : Inframaxillary branch of facial, mylohyoid, 

 pneumogastric, and glossopharyngeal and hypoglossal. 



Glands : Submaxillary, deep portion of parotid, and 

 lymphatic glands. 



The Superior Carotid Triangle. (" Triangle of Election"} 



Boundaries. By the posterior belly of the digastric, the 

 anterior belly of the omohyoid, and the anterior border 

 of the sternomastoid. 



Floor is formed by the hyoglossus, thyrohyoid, middle 

 and inferior constrictors ; hyoid bone and thyroid cartilage. 



Its Contents. Arteries : Common, external and internal 

 carotids ; superior thyroid, lingual, facial, occipital, and 

 ascending pharyngeal. 



Veins : Internal jugular, veins corresponding to the 

 above branches of the external carotid. 



Nerves : Inframaxillary branch of facial, superficial 

 cervical, descendens and communicans hypoglossi, hypo- 

 glossal, pneumogastric, spinal accessory, and superior 

 laryngeal. 



Parts of the larynx and pharynx and lymphatic glands. 



The Inferior Carotid Triangle. ( ' ' Triangle of Necessity. ' ') 

 Boundaries. By the median line, anterior border of the 

 sternomastoid, and anterior belly of the omohyoid. 



