454 



OPEEATIONS ON THE EESPIEATOEY APPAKATUS. 



Fia. 397.— Parotid Eeglon— Superficial Layer. 

 PP, parotid gland; Mpa, parotido-aurioular muscle; 3, tranaveral artery of the face; 

 4, maxillo-muscular vein; 7, jugular vein ; 8, glosso-facial vein; 9, transversal vein of 

 the face; 10, maxillo-muscular -vein; 12, posterior auricular vein; 13, facial nerve; 

 15, auricular tiranch of the 2d cervical pair. 



The arteries are the three divisions of the primitive carotid ; 

 1st, the occipital, which, by its mastoid branch, runs over the ex- 

 ternal surface of the styloid process of the occipital bone ; 2d, the 

 internal carotid, which runs upward through the thickness of the 

 fold of the mucous membrane which forms the guttural sacs ; 3d, 

 the external carotid, with its parotid branches, the maxUlo-mus- 

 cular, the posterior auricular, the superficial temporal trunk and 

 the internal maxillary. The veins, which are numerous, empty 



