INTERNAL MAXILLARY ARTERY. 355 



between the jaw and the internal lateral ligament of the temporo-maxillary 

 joint, then passes obliquely forwards and upwards on the outer surface of 

 the external pterygoid muscle (not unfrequeutly beneath and within it), 

 aad opposite the interval between the two heads of that muscle, bends 

 inwards to the spheno- maxillary fossa, where it ends by division into a 

 number of branches. 



To facilitate the arrangement of its numerous branches, this artery may 

 be considered in three parts, viz. : 1, the part between the jaw and internal 

 lateral ligament ; 2, the part in contact with the external pterygoid muscle ; 

 and, 3, the part in the spheno-maxillary fossa. 



Fig. 258. - 



Fig. 258. DEEP DISSECTION OP THE HEAD AND FACE, TO snow THE INTERNAL 

 MA.XILLARY ARTERY AND ITS BRANCHES (from Tiedemann). ^ 



The right half of the calvarium, the zygomatic arch, and the upper part of the lower 

 jaw have been removed : the external pterygoid muscle and some of the superficial muscles 

 of the face have been divided, and the internal pterygoid and buccinator muscles are 

 exposed : 1, facial artery, rising over the edge of the lower jaw ; 2, inferior labial 

 branches ; 2 , deep mental branch of the inferior maxillary artery ; 3, facial artery con- 

 tinued ; 4, superior coronary of the facial ; 5, lateral nasal branch ; 6, frontal branch of 

 the ophthalmic artery, giving descending twigs to communicate with the angular branch 

 of the facial and with the dorsal nasal ; 7, internal carotid artery ; 8, external carotid 

 artery at the place where it passes through the parotid gland, which has been removed ; 9, 

 division of the external carotid artery into superficial, temporal and internal maxillary 

 arteries ; 10, superfical temporal ; 11, masseteric branch of the external carotid artery ; 

 12, superiorly the trunk of the internal maxillary or deep facial artery, and inferiorly 

 its inferior maxillary branch ; 13, placed on the zygoma, points to the middle meningeal 

 branch, and above on the dura mater to its distribution ; 14, placed on the lower part of 

 the temporal muscle separated from the coronoid process of the jaw, indicates the 

 deep temporal branches of the artery; 15, pterygoid branches; 16, buccal artery; 17, 

 posterior superior dental, and deepest part of the internal maxillary artery where it enters 

 the spheno-maxillary fossa ; 18, branches of the infraorbital artery issuing upon the face. 



