THE SKULL 



57 



palatini). Near the cranial end of the hard palate are two 

 large openings close together near the middle line: these are 

 the foramina incisiva (or anterior palatine foramina) (s). 



Cavities of the Skull (Figs. 42 and 43). The bones of 

 the cranial portion of the skull enclose the cranial cavity for 



FIG. 42. SKULL. WITH DORSAL SURFACE REMOVED, SHOWING THE CRANIAL 

 AND NASAL CAVITIES. 



<z, foramen magnum; b, caudal end of liypoglossal canal; c, jugular foramen; d, 

 internal auditory meatus; e, tentorium. forming the cranial boundary of the cerebellar 

 fossa; f, dorsum sellas;^. sella turcica; /i, anterior clinoid processes; i, foramen 

 ovale; /, foramen rotundum; /, orbital fissure; /, optic foramen; m, chiasmatic 

 groove; . presphenoid bone; o, cribriform plate; p, lamina perpendicularis of eth- 

 moid; q, labyrinths of ethmoid; r, nares; s, foramina incisiva or anterior palatine 

 foramina; /, infraorbital foramen; , opening of the lachrymal canal; v, caudal 

 opening of posterior palatine canal; w, sphenopalatine foramen; jc, frontal process of 

 the malar; y, zygomatic process of the temporal; z, appendicular fossa, in the pe- 

 trous bone. 



the brain ; the facial bones enclose the nasal cavity, for the 

 olfactory organ. 



The cranial cavity is divisible into three principal fossae : 

 the cerebellar fossa (Fig. 43, /) caudad, for the cerebellum; 



