400 



THE SENSORIAL FUNCTIONS. 



in a vertical and longitudinal section of the 

 cavity of the human nostril, where they are seen 



covered by the Schneiderian membrane.* A 

 transverse and vertical section of these parts is 

 given in Fig. 383. t The turbinated bones are 

 curiously folded, and often convoluted in a spiral 

 form, with the evident design of obtaining as 



* This figure shows the branches of the olfactory nerve (o), 

 passing through the thin cribriform plate of the ethmoid bone, 

 and distributed over that membrane. Several of the cells, which 

 open into the cavity, are also seen ; such as the large sphenoidal 

 sinus (s), the frontal sinus (f), and one of the ethmoidal cells 

 (c). N, is the nasal bone ; p, the palate ; and e, the month of 

 the Eustachian tube, which leads to the ear. 



t In this figure, s, is the septum, or partition of the nostrils, 

 on each side of which are seen the sections of the turbinated 

 bones projecting into the cavity ; the ethmoid cells (c), situated 

 between the orbits (o) ; and the Antrum maxillare (a), which 

 is another large cavity communicating with the nostrils. 



