

PTERYGO-MAXILLARY REGION. 



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The Temporal is a broad radiating muscle situated at the side of the head, and 

 occupying the entire extent of the temporal fossa. It arises from the whole of 

 the temporal fossa, which extends from the external angular process of the frontal 

 in front, to the mastoid portion of the temporal behind ; and from the curved line 

 on the frontal and parietal bones above, to the pterygoid ridge on the great wing 

 of the sphenoid below. It is also attached to the inner surface of the temporal 

 fascia. Its fibres converge as they descend, and terminate in an aponeurosis, the 

 fibres of which, radiated at its commencement, converge into a thick and flat 

 tendon, which is inserted into the inner surface, apex, and anterior border of the 

 coronoid process of the jaw, nearly as far forwards as the last molar tooth. 



Relations. By its superficial surface, with the integument, the temporal fascia, 

 aponeurosis of the Occipito-frontalis, the Attollens aurem and Attrahens aurem 

 muscles, the temporal vessels and nerves, the zygoma and Masseter. By its deep 

 surface, with the temporal fossa, the External pterygoid and part of the Bucci- 

 nator muscles, the internal maxillary artery, its deep temporal branches, and 

 the temporal nerves. 



Nerves. Both muscles are supplied by the inferior maxillary nerve. 



10. PTERYGO-MAXILLARY EEGION. 

 Internal Pterygoid. External Pterygoid. 



Dissection. The Temporal muscle having been examined, the muscles in the pterygo-maxil- 

 lary region may be exposed by sawing through the base of the coronoid process, and drawing it 

 upwards, together with the Temporal muscle, which should be detached from the surface of the 

 temporal fossa. Divide the ramus of the jaw just below the condyle, and, also, by a transverse 

 incision extending across the commencement of its lower third, just above the dental foramen ; 

 remove the fragment, and the Pterygoid muscles will be exposed. 



Fig. 152. The Pterygoid Muscles ; the Zygomatic Arch and a portion of the 

 Ramus of the Jaw having been removed. 



The Internal Pterygoid is a thick quadrilateral muscle, and resembles the 

 Masseter in form, structure, and in the direction of its fibres. It arises from the 

 pterygoid fossa, its fibres being attached to the inner surface of the external 

 pterygoid plate, and to the grooved surface of the tuberosity of the palate bone ; 



