THE SKULL THE CRANIUM 



309 



tenth and eleventh scrolls counting from the upper border, or as the 

 third and fourth scrolls counting from the lower border ; on the inner 



FIG. 236. 



Opposite Inner Surface of Fifth Piece. 



Opposite Inner Surface of 

 Fourth Piece. 



FIG. 237. 



Attachment to Cribriform Plate. 



I 



-j- Eleventh Outer Scroll, 6". 

 Partition, 6. 



Tenth Outer Scroll, 6'. 



SIXTH PIECE OF LATERAL ETHMOID, OUTER ASPECT. 



surface (Fig. 219) it is the large, triangular, subdivided seventh scroll 

 (6) from the superior border. When it is removed and examined on 

 the outer surface (Fig. 

 236) it is apparent that 

 there are three scrolls, 

 two above the partition 

 and one below (Fig. 

 237). The two sepa- 

 rated by the partition 

 are small and similar, 

 but the uppermost one is 

 prolonged forward, and 

 its lower surface is cut 

 into secondary scrolls. 

 On the posterior part 

 of the inner surface 

 (Fig. 238) is a deep 

 excavation which fits 

 over the outer, upper 

 part of the last or 

 seventh piece (scroll 7'). 



-Palatine 



TRANSVERSE VERTICAL SECTION THROUGH HALF OF FACE. 



The Seventh 01' Three millimetres anterior to central part of cribriform plate of 



ethmoid. Cut surfaces black. (Somewhat diagrammatic.) 



lowest piece is of more 



regular form, showing on the outer aspect of the ethmoid (Fig. 239) 

 the lowest two scrolls and their dividing partition, and on the inner 

 aspect (Fig. 240) the single, large scroll. The posterior end of this 

 scroll fits into the sphenoidal sinus ; the posterior part of the partition 

 is attached to an oblique ridge on its outer wall (Fig. 185). 



