420 CHARLES CLIFFORD MACKLIN 



that of the lacrimal; its posterior surface forms the anterior wall 

 of the space containing the naso-lacrimal duct (fig. 4). The 

 palatal process does not quite reach to the median plane and 

 anteriorly it is separated by a notch from the extremity of the 

 alveolar process: its medial border is below and lateral to the 

 vomer, and its posterior border underlies the palatine bone for a 

 considerable distance. 



The alveolar process is a very irregular ridge of bone, occupying 

 the inferior and lateral edge of the maxilla, and its anterior end 

 extends medially almost to the mid-line, coming to lie in advance 

 of the palatine process. In its lower aspect may be seen the 

 depressions for the future dental alveoli. The zygomatic process 

 is a more lateral coarse spicule of bone, which projects back- 

 ward and outward until its extremity almost touches the inner 

 surface of the zygomatic bone. It is perforated from above 

 downwards by foramina, and just before it joins the body of the 

 bone it sends up a small process, which marks off a groove occu- 

 pied by the second branch of the trigeminal nerve (fig. 17). 

 There is as yet, therefore, no foramen for this nerve trunk. The 

 posterior edge of this process is continuous inwardly with the 

 posterior edge of the palatal process. Anteriorly a spicule from 

 the upper part of the anterior extremity of the alveolar process 

 projects forwards, and lies lateral to and below the anterior 

 part of the anterior paraseptal cartilage, to which it is closely 

 applied. This is the anlage of the anterior nasal spine. 



The palate bone (figs. 2, 3, 14, 15 and 16) is a thin, delicate 

 lamella of osseous tissue, strongly concave inward, which walls 

 in the dorsal portion of the nasal cavity. Its borders are ser- 

 rated; the upper being fitted into the dorsal palatine notch of 

 the ectethmoid, and ventrally to this into the ventral palatine 

 notch. The incurled lower edge (fig. 2) which becomes the 

 palatal plate, approaches but does not meet its fellow of the 

 opposite side, being separated from it in the model by a space 

 of 15 mm. Dorsally the anlage of the pyramidal process is 

 represented by a thickened and irregular projection which lies 

 ventral to the medial pterygoid lamina. 



