616 



DISSECTION OF THE PTERYGOID REGION. 



of the skull through the foramen ovale and foramen lacerum. 



From the plexus the large internal maxillary vein leads backwards, 

 and outlets, and another considerable branch, the anterior internal maxillary or 



deep facial vein, descends to the face to join the facial vein. A 



prolongation of the plexus into the spheno-maxillary fossa is often 



distinguished as the alveolar plexus. 



inferior The INFERIOR MAXILLARY NERVE (fig. 222) is the largest of the 



nerve! ar: three trunks arising from the Gasserian ganglion. It leaves the 



FIG. 222. DEEP VIEW OF THE PTERYGOID REGION (ILLUSTRATIONS OF 

 DISSECTIONS). 



Muscles : 



A. Temporal reflected. 



B. Condyle of the jaw disarticu- 

 lated forwards, with the external 

 pterygoid attached to it. 



c. Internal pterygoid. 



D. Buccinator. 



F. Masseter thrown down. 



Nerves : 



1. Buccal. 



2. Masseteric, cut. 



3. Deep temporal. 



4. Auriculo-temporal. 



6. Chorda tympani. 



7. Inferior dental. 



8. Lingual. 



10. Internal lateral ligament of 

 the lower jaw. The arteries are not 

 numbered with the exception of the 

 internal maxillary trunk, which is 

 marked with 9. 



skull by the foramen ovale in the sphenoid bone, and divides 

 immediately below that opening into tvvo principal pieces, viz., an 

 anterior smaller part, which is distributed mainly to muscles, and 

 a larger posterior part, ending in branches which are, with one 

 exception, altogether sensory. In addition to these, the nerve of 

 the internal pterygoid muscle arises from the inner side of the 

 primary trunk. 



Directions. Should the internal maxillary artery obstruct the view 

 of the nerve, it may be cut through. 



