342 



HUMAN ANATOMY. 



The nasal fossce are the two .bony cavities already described 

 .(vide page 36). They are lined throughout with mucous mem- 

 brane called Schneiderian membrane, which is continuous with 

 the antrum of Highmore, frontal, ethmoidal, and sphenoidal 

 sinuses, with the conjunctiva through the lachrymo-nasal duct, 

 with the pharynx through the posterior nares, and with cavity 

 of the tympanum through the Eustachian tube. Its epithelium 

 is columnar, ciliated in the lower part and the sinuses, and is 



Lamina papyr. oss. ethmoid. 



Foramina ethmoid. 

 Proc. orbit, oss. palat. 

 Corpus oss. sphenoid. 



For. optic. 

 Fissura orbit, sap. 

 Bella turcica 



Spina trochlear. 

 Bars orbit, oss. front. 



Oa lac r! male 



Fossa sacci lacrim. 

 Os nasala 



orbit, maxill. 

 oo. nncin. OSS. 



ethmoid. 

 Proc. ethmoid, conchae 



nasal, inf. 



Froc. maxill. conchaa 

 nasal, inf. 



For sphenopalat. 

 Fofta pterygopalat 



Lamina lat. proo. pteryg. 



Proc. pyramid, oss. palat. 



Sinus maxillaria 

 Pars perpendic. oss. palat. 



Sonde in canal, palat. 



FIG. 154. 



Inner wall of orbit and adjacent parts. (His.) (Ball.) 



columnar but not ciliated in the membrane to which the olfactory 

 nerve is distributed. 



Arteries are anterior and posterior ethmoidal from the 

 ophthalmic to the roof, frontal and ethmoidal sinuses, spheno- 

 palatine from the internal maxillary to the mucous membrane of 

 the spongy bones, septum, and meatuses, and alveolar from the 

 internal maxillary to the antrum. 



Veins empty into facial, ophthalmic, and beginning of great 

 longitudinal sinus. 



