1344 



CLINICAL AND TOPOGRAPHICAL ANATOMY 



opens into the mouth opposite the second molar tooth. The level of the duct, 

 somewhat inconstant, would be usually about a finger's breadth below the 

 zygoma. It is accompanied by the transverse facial artery above, and the 

 infraorbital branch of the facial nerve below. 



The sheath of the parotid, continuous with those of the masseter and sterno-mastoid, is 

 strong enough to cause most exquisitely painful tension when inflammation of the gland is 

 present, and, together with the presence of deep processes of the gland in connection with the 



Fig. 1093. — Scheme of the External Maxillary (Facial) Artery. (Walsham.) 



Orbicularis oculi muscle 



Transverse facial artery 

 M. quadr. labii sup. 



(caput zygom.) 

 Zygomaticus muscle 



Buccinator muscle 

 Masseteric branch 



Masseter muscle 



Stylo-pharyngeus 

 muscle 

 Stylo-glossus muscle 

 Ascending palatine 

 branch 

 Tonsillar branch 



External maxillary 



artery 



External carotid 



artery 



Posterior belly of 



digastric muscle 



Lingual artery 



Frontal branch of ophthal- 

 mic artery 



Nasal branch of ophthal- 

 mic artery 



■Angular artery 



M. quadr. labii 

 sup. (caput ang.) 

 -Infraorbital artery 

 Caput Infraorb. 

 ■Lat. nasal artery 

 Caninus muscle 



~Artery of septum 



Superior labial 



artery 



Risorius muscle 



Inferior labial artery 



Mental branch of inferior 



alveolar artery 

 Quadratus labii inferioris 



muscle 

 ■Inferior labial artery 

 Triangularis muscle 



Submental artery 

 Branches to submaxillary 

 gland 

 Anterior belly of digastric muscle 



Mylo-hyoid muscle 

 Hyo-glossus muscle 



Hypoglossal nerve 



mandibular (glenoid) cavity and styloid process, to explain the deep burrowing of pus which 

 rnay take place into the pharynx and pterygoid region. The relation of the capsule to growths, 

 innocent or xnalignant, of the parotid is also important (See figs. SG5, 1092). 



The parotid region would be thus mapped out (fig. 1096). Above by the pos- 

 terior two-thirds of the zygoma; beloiv, by a line corresponding to the posterior 

 belly of the digastric (fig. 1090) ; behind, are the external auditory meatus, mastoid, 

 and .sterno-mastoid. hi front the gland and socia parotidis overlap the posterior 

 part of the masseter, to a variable degree (fig. 1096). 



