THE BONES OF THE HEAD 



143 



the infratemporal crest of the sphenoid, the inferior limit being the 

 molar portion of the alveolar border of the superior maxilla and 

 the lower border of the external pterygoid plate. 



The contents of the fossa are as follows : the coronoid process 

 of the inferior maxilla with the insertion of the temporal muscle ; 

 the external and internal pterygoid muscles ; the first and second 

 parts of the internal maxillary artery, and the pterygoid plexus of 

 veins ; the inferior maxillary division of the fifth cranial nerve and 



Fronto-Malar Suture 



Orbital Plate of Frontal 



Glabella 



Fronto-nasal Suture ^ 

 Fronto-maxill. Suture _ 



Nasal Bone 



Nas. P. of Sup. Max -^ 

 Lachrymal Groove 

 Orbital Surf. o{-^-- 

 Lachrymal Bone 



Great Wing of Sphenoid 



I , Spheno-maxillary Fissure 



I / 



/Back Part of Infra-orb. Groove 

 /Spheno-maxillary Fossa 



Infratemporal Crest 

 *Spheno-palat. Foramen 

 \\V''\ VA /I / /' /' ,Zygom. Surf, of Great 

 ffe:;-\\/,VV/^/ / Wing of Sphenoid 

 w>\:;. \>, >\r >A; / Pteiygo-maxiUary 



/ / }'> 'XVV y Fissure 



/^\y^ /Zygoma 



y Preglenoid 

 Tubercle 



■* Foramen Ovale 

 Foram. Spinosum 



-■^■^__ Spine of Sphenoid 

 Openings of Posterior 

 Dental Canals 



External Pterygoid Plate of 

 Sphenoid 



I Hamular Process 

 Tuberosity of Palate Bone 

 Tuberosity of Superior Maxilla 



Fig. 83. — The Zygom.\tic and Spheno-Maxillary Foss;e. 



Incisor Fossa 



Canine Fossa 



its branches, together with the otic (Arnold's) ganglion ; the chorda 

 tympani ner\'e ; and the spheno-mandibular ligament. 



The foramina which communicate with the fossa are as follows : 

 the foramen ovale ; the foramen spinosum ; the openings of the 

 posterior dental canals ; and the inferior dental foramen. 



The fossa presents two fissures — spheno-maxillary and pterygo- 

 maxillary. 



The spheno-maxillary fissure lies horizontally between the great 

 wing of the sphenoid and the superior maxilla. Externally it is 



