TURBINATED BONES. Gl 



extremity forming a pulley, round which the tendon of the tensor 

 palati muscle plays. 



VOMER. 



This, the only single bone in _.lhe._.snp.eripr facial region, is a 

 long bone aonstructed of two thin plates, with a deep groove 

 between^^nd extends along the middls line of the floor of the 

 nasal chambers from the sphenoid to the premaxilla. It presents 

 two surfaces, two borders, and tv/o extremities. 



The tv/o lateral surfaces, narrow anteriorly and wider poste- 

 riorly, are smooth, and, in the fresh state, covered by mucous 

 membrane. The superior herder is deeply grooved for the 

 reception of the cartilaginous septum of the nose ; the inferior 

 border is sharp and smooth in its posterior half, whero it forms 

 the division between the posterior nares ; the remaining portiou 

 is broad, flat, and slightly dentated to articulate with the maxih 

 lary bones. The posterior extremity is broad from side to side, 

 convex below, and concave above, where it opens out into a 

 crescentic border which embraces the 'sphenoid, and forms an 

 irregular hiatus between the two bones for the passage of the 

 nerves and blood-vessels which supply the septum. The ante- 

 rior extremity is flat, and rests on the palatine process of th» 

 premaxilla. 



The vomer articulates with the sphenoid, ethmoid, palatine, 

 pterygoid, superior maxillary, and preniaxillary bones. 



TURBINATED BONES. 

 (Fig. 13. 6, 12.) 



These, also called the turbinals, four in number, one superior 

 and one iuferior on each side, are found in the nasal chambers, 

 and arejrr^gufer-feony columns, larger^osTefiofly'tEananteriorly, 

 flattened from side to side, and hollowed within, dividing the 

 nasal passages into superior, middle, and inferior meati. 



The superior or ethmoidal turlinol is attached to the ridge 

 on the nasal bone and to the ethmoid, and the inferior or 

 maxillary turhinal to the ridge on the superior maxilla. They 

 are formed of very delicate and reticulated rolls or convolutions 

 of bone void of periosteum. The superior is the larger of the 

 two, and extends from the ethmoid to near the external opening of 



