SUPERIOR :maxillary bone. 



47 



hollowed out beneath the orbital plate in tlie body of the bone. The 

 superior maxillary bone articulates with its fellow, with the nasal, 

 frontal, lachrymal, ethmoid, palate, malar, vomer, and inferior turbi- 

 nated bones, and with the nasal cartilages. 



The alveolar hordrr or process, thick and arched, is hollowed out into 

 sockets or rtfew?/, corresponding in number, form, and depth to the roots 

 of the teeth, whicli are fixed in them. 



The ?w/r//5 plife, along with that of the opposite side, forms about 

 three-fourths of the hard palate. Its superior surface is smooth and 

 concave from side to side ; its inferior surface is vaulted and rough, 

 and is marked laterally with grooves for nerves and vessels, which 

 reach the palate through the posterior palatine canal. Its posterior 

 extremity falls short of that of the alveolar arch and body of the l)one, 

 and articulates with the horizontal process of the palate bone, which 

 completes the hard palate. The mesial border rises into a serrated 

 vertical ridge, which, with its fellow, constitutes in front the nasal 



Fis. 



39. — Superior Maxillary Bone of the 

 Right Side. (A. T.) ^ 



A, from the outside ; B, from the inside. 



1 to 2, alveolar process or arch — 1 at the 

 middle incisor tooth, 2 marks the tuberosity, 

 and above it, in A, the posterior dental foramina ; 

 3, the nasal or ascending process ; 4, malar 

 tuberosity or process ; .^), orbital plate or process ; 

 6, placed in front of the nasal notch marks the 

 nasal crest terminating in the nasal spine ; 7, the 

 incisor or myrtiforni fossa ; S, is in front of the 

 canine fossa ; 9, the infra-orbital foramen, and 

 below 5, the infra-orbital groove and canal ; 10, 

 groove of the nasal or lachrymal duct ; 1 1 , antrum 

 maxillare, or maxillary sinus ; 12, marks the 

 oblique ridge for the attachment of the inferior 

 turbinated bone ; 13, is placed above the i^alate 

 plate ; from 13 to 6, the vomeric and nasal crest ; 

 from 13 to 14, the anterior palatine foramen ; 15, 

 placed on the surface of articulation of the body 

 ■with the palate bone, points to the groove of the 

 palato-maxillary canal. These figures also exhibit 

 a full set of the upper teeth of one side as they 

 occur in middle life. 



crost — a grooved elevation which sup- 

 ports the extremity of the vomer and 

 the septal cartilage, and is prolonged 

 forwards into the nasal spine. This 

 ridge is interrupted at its anterior 

 part by a canal, the incisor foramen, 

 which is completed on its mesial side by a 

 from the anterior to the posterior border, 

 widens out below into a larger hollow, which when ]Dlaced in appo- 

 sition Avith that of the opposite side, completes a mesial aperture, 

 the anterior palatine foramen. Viewed from below, this aperture may 

 be seen to be divided into four smaller foramina, two of which, placed 

 laterally, are the incisor foramina, called also foramina of Stenson, while 

 the other two, placed in the middle line, one before, the other behind, 



slender lamina passing 

 Each incisor foramen 



