Bones of the Skull. 



55 



Sinus frontali s 



Lamina papyracea ossis ethmoiclalis 



Foramina ethmoidalia 

 Processus orbitalis ossis palatini i 

 Corpus ossis sphenoidalis 



Foramen opticum 



Fissura orbitalis superior 

 Sella turcioa 



Probe in 



foramen 



rotundum 



Foramen 

 ovale 



Probe in 



canalis 



pterygoideus 



Foramen sphenopalatinum ' 



Fossa pterygopalatina ' 



Lamina lateralis / ' 



processus pterygoidei ' 



Processus pyramidalis ossis palatini 



Spina trochlearis 



Pars orbitalis ossis 

 frontalis 



Os lacrimale 



Fossa 

 sacci lacrimalis 



Os nasale 



Facies orbitalis maxillae 



Processns uncinatus 

 ossis ethmoidalis 



Processus ethmoidalis 

 conchae nasalis inferioris 



Processus maxillaris 

 conchae nasalis inferioris 



Probe in canalis palatinus Pars perpendicularis 



ossis palatini 



Sinus maxillaris 



68. Right pterygopalatine fossa, fossa pterygopalatina, 



from without. 



(The main portion of the ala magna oss. sphenoid., of the lateral part of the corpus maxillae 



and of the pars orbit, oss. front, have heen removed by a sagittal section, so that the medial 



wall of the sinus maxillaris and of the orbit is visible ) 



The fossa pterygopalatina (0. T. sphenomaxillary fossa) (see also Fig. 67) lies, deeply 

 concealed, between the bones medianward from the fossa infratemporalis. It is united with 

 the latter by a sickel-shaped space, broad above, narrow below, which is closed below and lateral- 

 ward by periosteum. Its medial wall is formed by the lateral surface of the pars perpendicu- 

 laris oss. palatini, its upper wall by the lateral portion of the inferior surface of the body of 

 the sphenoid, the posterior by the sphenomaxillary surface of the ala magna oss. sphenoidalis 

 and by the anterior surface of the processus pterygoideus, the anterior by the processus orbitalis 

 oss. palatini and by the most posterior margin of the corpus maxillae. Below it narrows to 

 become the canalis ptcryyopalatinus which is continued into the canales palatini oss. palatini 

 and opens at the foramina palatina majus et minora on the under surface of the hard palate; 

 in addition, delicate canals pass through the pars perpendicularis oss. palatini from the canalis 

 pterygopalatinus into the nose. On the anterior wall connection is made with the orbit by 

 means of the fissura orbitalis inferior, with the anterior surface of the face by the sulcus and 

 canalis iniraorbitalis. On the medial surface, the wide foramen sphenopalatimim leads into 

 the nose. From the posterior surface the foramen rotundum goes into the cavity of the 

 skull, the canalis pterygoideus and the canalis pharyngeus to the lower surface of the base 

 "f the skull. 



