A MANUAL OF ANATOMY 



the posterior palatine or palato-maxillary canal for the great or 

 anterior descending palatine nerve and the superior or descending 

 palatine artery. In front of this groove the external surface 

 articulates with the inner surface of the superior maxilla behind 

 the opening of the an rum. Behind the groove the external surface 

 articulates interiorly with the posterior border of the superior 

 maxilla, and superiorly with the internal pterygoid plate of the 

 sphenoid. 



The anterior border of the perpendicular plate presents, just 

 below the inferior turbinate crest, a leaf-like projection, called the 

 maxillary process, which closes the lower and back part of the 

 opening of the antrum of Highmore. Superiorly it articulates with 

 the ethmoid, and interiorly with the superior maxilla. The pos- 

 terior border articulates superiorly with the anterior border of 

 the internal pterygoid plate of the sphenoid, and interiorly it 



Spheno-maxillary Surfaces^.,,^ 

 Sphenoidal Process.^ 



Inner Boundary of 

 Pterj'go-maxillary Fissure 



Orbital Process 



% ^ Spheijo-palatine Notch 



'*^ For Superior Maxilla 



.Maxillary Process 

 for Maxillary Sinus 



Tuberosity j Groove for Post. Palatine Canal 



! i 



For Zygomatic Fossa For Post. Border of Sup. Maxilla 



Fig. 69. — The Right Palate Bone (External View). 



is prolonged into the tuberosity. The inferior border is attached, 

 and m:'ets the horizontal plate. The superior border presents the 

 orbital and sphenoidal processes and the spheno-palatine notch, to 

 be presently described. 



The pyramidal process or tuberosity projects backwards, down- 

 wards, and outwards from the meeting of the horizontal and per- 

 pendicular plates, and is received into the pterygoid notch of the 

 sphenoid. Posteriorly it presents three grooves. The central 

 groove forms part of the pterygoid fossa, and gives origin to 

 fibres of the internal pterygoid. The grooves on either side are 

 rough, and articulate with the anterior borders of the correspond- 

 ing pterygoid plates. The tuberosity on its inferior aspect, close 

 to the horizontal plate, presents two small openings, which are 

 the orifices of the posterior and external accessory palatine canals, 

 the latter being the smaller of the two, and inconstant. These 

 canals transmit the posterior and external descending palatine 



