538 ANATOMY IN A NUTSHELL. 



Areolar process lias eighl cavities in it for the teeth. This process is broad- 

 est behind and is the most spongy part of the superior maxillary bone. Its 

 outer surface behind the first molar tooth gives origin to the Buccinator muscle. 



The palate process, which passes inward from the inner surface of the 

 body, forms part of the floor of the nasal cavity and the roof of the mouth. 

 On its. lnferior surface is a longitudinal groove or canal for the posterior 

 palatine vessels and the anterior and external palatine nerves. It articulates 

 with the vomer, the palate, and with its fellow process of the opposite side. 

 At the point where the two palate processes meet anteriorly is the anteriok 

 palatine canal or fossa. There are four openings in the bottom of this 

 fossa, the two lateral openings are called foramina of Stenson, and transmit 

 anterior branches of the descending palatine arteries. The anterior and pos- 

 terior foramina are called the foramina of Scarpa, and transmit the naso-pala- 

 tine nerves. The left nerve passing through the anterior one and the right 

 nerve through the posterior one. Sometimes a suture passes from this fossa on 

 each side to the interval between the canine and incisor teeth, thus making a 

 bone called the intermaxillary or incisive hone. See plate CCXXVIII. 

 The SUPERIOR SURFACE is concave transversely and forms part of the floor of 

 the nose, and has the upper openings of the canal of Scarpa and the canal of 

 Stenson. The anterior part of the inner border of this surface is called the 

 nasal crest, which articulates with its fellow thus making a groove to receive 

 the vomer. The anterior extremity of the nasal crest is the anteriok nasal 

 SPINE. 



OSSIFICATION. — This bone ossifies from seven centers. 



Articulation. — it articulates with nine bones. The frontal and ethmoid 

 of the cranium, and the nasal, malar, lachrymal, inferior turbinated, palate, 

 and vomer of the face, and with its fellow of the opposite side. Sometimes 

 it articulates with the external pterygoid plate of the sphenoid and also with 

 the orbital plate of the sphenoid. 



Attachment of Muscles. — It has twelve muscles attached to it. The 

 Orbicularis palpebrarum of the palpebral region, the Inferior oblique of the 

 orbital region, Levator labii superioris aleque nasi of the nasal region, Levator 

 anguli oris of the superior maxillary region, the Compressor nasi. Depressor 

 alse nasi, Dilator nares posterior of the nasal region, Masseter of the temporo- 

 maxillary region, Buccinator of the inter-maxillary region. Internal ptery- 

 goid of the pterygo-maxillary region, Orbicularis oris of the intermaxillary 

 region, Levator labii superioris propius of the superior maxillary region. 



lb. odd Supply. Infraorbital, alveolar, descending palatine, ethmoidal, 

 frontal, nasal, and facial arteries. 



LESSON CLXXXII. 



I 1 i Orbicularis palpebrarum muscle has been described on page 508. 



(2) Inferior oblique. 



Origin. It arises fr the orbital plate of the superior maxillary bone. 



