TEMPORAL AND INFRATEMPORAL REGIONS 171 



mandibular ligament also will be seen. It is the thin strip of 

 membrane which lies medial to the inferior alveolar nerve. 



Musculus Pterygoideus Externus. The external pterygoid 

 arises in the infratemporal fossa by two heads, an upper and 

 a lower. The upper head, which is the smaller, springs from 

 the infratemporal ridge and infratemporal surface of the great 

 wing of the sphenoid ; the lower head takes origin from the 



M. temporalis 



.Deep temporal artery 



/Deep temporal nerve 



Deep temporal artery 



Deep temporal nerve 

 Masseteric nerve 



M. buccinator 



Superficial temporal artery 

 Auriculo-temporal nerve 



M. pterygoideus externus 

 Middle meningeal artery 



Mastoid process 

 External carotid 



Accessory meningeal artery 

 Inferior alveolar artery 



' Mylo-hyoid artery and nerve 

 1 Inferior alveolar nerve 

 Lingual nerve 

 M. pterygoideus internus 



FIG. 63. Dissection of the Infratemporal Region. 



lateral surface of the lateral pterygoid lamina. The muscle 

 diminishes in width as it passes backwards, and it is inserted 

 into the fovea on the anterior surface of the neck of the 

 mandible, and also into the capsule of the mandibular articu- 

 lation at the level of the anterior margin of the articular 

 disc of the joint. It protrudes and depresses the mandible 

 and pulls it towards the opposite side. It is supplied by a 

 branch of the mandibular division of the trigeminal nerve. 



