OSTEOLOGY 33 



two in number, are located at the outer border and at the junction 

 of the processus frontalis of the nasal, with the frontal bone. 



Description. — The lacrimal bone is small, and rather filiform. 

 They become fused with the nasal and the frontal bones, forming 

 part of the margin of each. 



The Palatine. — Location. The palatine bones, or ossa palatina, 

 two in number, enter into the formation of the inner part of the bony 

 gum and hard palate, or roof of th^, mouth. They form the support 

 for the hard palate. Each palatine articulates posteriorly with 

 the rostrum, or nasal portion of the sphenoid, and with the pterygoid; 

 and anteriorly with the maxilla. 



Description. — The palatine bone is curled posteriorly and is thin 

 at the upper portion and thick at the lower border. Anteriorly 

 it has a long rather filiform projection. 



The Pterygoid. Location. — The pterygoid bones, or ossa ptery- 

 goidea, two in number, are located back of the region of the 

 posterior nares. They extend diagonally outward and backward 

 from the median region of the sphenoid rostrum to the quadrate 

 bone. They articulate anteriorly with the sphenoid rostrum and 

 the palatine, and posteriorly with the quadrate. 



Description. — The pterygoid bones are slender and cylindrical, 

 and are expanded at the ends into an articular facet. 



The Zygomatic. Location.— The zygomatic, or ossa zygomatica, 

 two in number are situated below the orbital cavity and extend 

 from the maxiUa to the quadrate bone. 



Description. — The zygomatic is small, slender, rod-shaped, and 

 forms the lateral portion of the upper jaw. The anterior portion 

 of the zygomatic represents the jugal and is fused with the max- 

 illa and with the anterior processus maxillaris of the nasal bone, 

 the maxilla, and the posterior portion, the quadrato-jugal, which 

 articulates with the quadrate bone. 



The Vomer. Location. — The vomer is located in the median 

 nasal septum. It articulates with the rostrum of the sphenoid, 

 being connected to it by a mass of ligaments. It touches ante- 

 riorly the posterior portion of the maxilla. 



Description. — The vomer is a median bone and aids in the forma- 

 tion of the septum nasi. It consists of a thin plate, thickest pos- 

 teriorly and diminishing toward the anterior edge. 



The Jugal and Quadrato-jugal. — The jugal and quadrato-jugal 

 are united forming a long slender cyUndrical bone called the zygo- 



