INTERXA L MA XILLA R Y 



493 



pterygo-])alatine; and (6) the naso- or sphono-palatine. All tliese branches pass 

 through l)ony canals. 



Braiirhes of the First Part of the Liter ml Maxilla ri/ Arteri/. — (1) TIr- deep 

 auricular (fig. 83(i) passes upwards in the substance of the parotid gland behind 

 the capsule of the temj)oro-maxillary joint, and, perforating the bony or cartilagi- 

 nous wall of the external auditory meatus, supplies the skin of that passage and 

 the nienibrana tynipani. It at times gives a branch to the joint as it passes behind 

 the temporo-maxillary capsule. 



(2) The tympanic branch, or Glaserian artery, is a long slender vessel, which 

 runs upwards bcliind the condyle of llic jaw to the Glaserian fissure, through which 

 it passes to the interior of the tympanum. Here it supi)lies the lining membrane 

 of that cavity and the laxator tympani muscle, and anastomoses with the other 

 tym})anic arteries, forming with the tympanic branch of the stvlo-mastoid arterv a 



Fig. 336.— Scheme of Left Ixterxal Maxillaey Artery. (Walsliam.) 



Infraorhital artery and nerve Sjjfieno-pataline branch 



Posterior or descending palatine branch 

 ine branch 



anch 



ior deep teiiijjoral artery 



ternul plerygoid branch 



Orbital branch 



yaxal branch 

 Anterior 

 dental hr 



Labial branch 



Posterior dental 



branch 



Incisive branch 

 Mental branch 



Submental branch 



Posterior deep temporal artery 

 j I, I y Small meningeal 



"/ /'.' / / , / artery 



Middle meningeal 

 artery 



Temporal artery 

 Ti/ni/ianic brajtch 



Ii'ep auricular 



branch 

 I IRICi'LO-TEM- 

 fORAL XERVK 



Masseteric branch 



External carotid 

 artery 



Internal lateral or 

 spheno-mandibu- 

 lar ligament 



Mandibular or 

 inferior dental 

 artery and nerre 



Buccal branch with Internal pterygoid branch 

 ~ piyrtioH of buccal nerve 

 Mylo-liyoidean branch 



vascular circle around the membrana tympani. This circle is more distinct in the 

 f(jetus than in the adult. 



(3) The large middle meningeal is the largest branch of the internal maxillary 

 artery. It comes off from that vessel as it lies between the spheno-niandibular liga- 

 ment and the ramus of the jaw, and under cover of the external ]iteryg(iid passes 

 directly upwards to the foramen spinosum, through which it enters the interior of 

 the cranium. In this part of its course it is crossed by the chorda tympani nerve; 

 and just before it enters the foramen is embraced by the two heads of origin of the 

 auriculo-temporal nerve (fig. 336). 



The trunk of the mandibular division of the fifth nerve, as the latter emerges 

 through the foramen ovale, lies in front of the artery. As the artery passes upwards 

 it is surrounded by filaments of the symjtathetic nerve, and is accompanied by two 

 veins which open into the internal maxillary vein. On entering the skull it ramifies 



