THE BONES. 67 



maxillary, and Palate bones, with the continuation of the cartilaginous sep- 

 tum Mobile,- is generally curved or twisted; forms the internal wall. 



4. Walls : a. superior, concave, formed by the Nasal bones, the nasal spine 

 of the os frontis, by the Ethmoid, with foramina Cribrosa, in the centre ; by 

 the Sphenoid behind. 



b. Inferior wall, broader, not so long, posteriorly deeper ; formed by the 

 Proc. palatin. of the Sup. Max., and the horizontal portion of the Palate bones ; 

 presents, canal, indsimts. 



c. External wall, very irregular, formed by : Ethmoid, Lacrymal, Palate, 

 Sup. Maxillary and the Inf. Turbinate bones ; presents from above to below. 



1. The superior Turbinate bone or Concha ; 



2. The superior nasal chamber, and on its posterior part the 



3. Foramen spheno-palatinum, and the openings of the superior Ethmoidal 

 and Sphenoidal cells. 



4. The middle Turbinate bone or Concha, and middle chamber with the 

 opening of the sin. maxillaris, and the anterior Ethmoidal and frontal cells. 



5. The inferior Turbinate bone and the inferior chamber, with the open- 

 ing 



6. of the Canalis Nasalis. 



Connection: with the Frontal, Ethmoid, Sphenoid, Superior 

 Maxillary, Orbital, Buccal, and Cranial cavities ; the last by the 

 foramina Cribrosa. 



70. 3. Cavitasoris; Buccal cavity, mouth, 



formed by the Superior Maxillary, and Palate bones, the Sphe- 

 noid and Inf. Maxillary ; contains the tongue, teeth, glands, and 

 buccal mucous membrane. 



1. Superior wall, palatal vault, palatwn durum; formed by: the Sup. 

 Maxillary bones, proc. palatini, the Palate bones, proc. horizontal and Sphe- 

 noid, proc. Pterygoid; presents : sutura cruciata, with the point, where 5 bones 

 meet together, namely, 2 Superior Maxillary, 2 Palate bones, 1 Vomer ; fora- 

 men Incisivum ; the openings of the can. pterygo-palatinus and the 2 Pala- 

 tini , Sulcus Palatinus close to the alveolar border, for the posterior palatine 

 nerves and vessels. 



2. Anterior and lateral walls ; formed by : the Alveolar processes with the 

 teeth of the jaw bones ; presents : on lower jaw, Spina mentalis interna, 

 proc. geni, for muse, genio-hyoidei and genio glossi , linea obliqua, or mylo- 

 hyoidea, under this, the fovea pro gland, submaxill., over it, fovea pro gland, 

 subll.ngual. , sulcus myfo-hyoideus and foram. maxillare internum. 



Connections : with the nasal canal by the can. incisivus, with 

 fossa spheno-maxillaris by canales palatini. 



71. 4. Malar fossa, fossa zygomatica. 



Situation : below the zygomatic arch, separated from the fossa 

 temporalis by the crista transversa of the Sphenoid bone. 

 Formed by : Sphenoid, Superior and inferior maxillary bones. 



1. Superior wall, formed by the inferior surface of the Ala Magna of the 

 Sphenoid bone. 



