304 MAMMALIAN ANATOMY 



When the second piece is seen from the inside (Fig. 226) , the longi- 

 tudinally bowed, slightly transversely concave upper surface is also 



FIG. 225. 



Second Outer Scroll, 2'. 



^\ 

 \ 



Attachment to Cribriform Plate. 



Partition, 2. V ,i^ Third Outer Scroll, 2". 



- Receives Fourth Outer Scroll, 3'. 



SECOND PIECE OF LATERAL ETHMOID, OUTER ASPECT. 



visible ; below this is the inner surface proper, which is marked by a 

 wide longitudinal median furrow. The upper surface and the inner 

 surface down to the lower edge of this furrow are received into the 



Fm. 226. 



Opposite Lower Surface of First Piece. 



Attachment to Cribriform Plate. 



Opposite Mesial Piece, m'. 

 SECOND PIECE OF LATERAL ETHMOID, INNER SURFACE. 



excavated lower surface of the first piece. The lower flattened part 

 of the inner surface is opposite the lower part of the outer surface of 

 the mesial piece (Figs. 220, 228, m'). 



The mesial piece (designated by m, the other pieces being num- 

 bered) is visible on the inner aspect, where it forms the second and 



FIG. 227. 



Second Inner Scroll, m'. 



Attachment to Cribriform 5 



~~N^ I :"%v Tliird Inner Scroll, m". 



Cleft Plate. 

 Partition, 



Receives Outer Surface of Fourth Piece. 



I 

 Cleft Plate. 



MESIAL PIECE OF LATERAL ETHMOID, INNER ASPECT. 



third inner scrolls (Fig. 219, m' and m") and appears on the outer 

 surface only as the thin, curved cleft plate which forms the upper part 



