84 Journal of Comparative Neurology and Psychology. 



Each of the specimens possessed 48 pairs of spinal nerves, 

 or 48 segments in its spinal cord. 



In the cervical divison and for about one-third the length 

 of the spinal cord of the emu, the spinal nerves are attached 

 at angles inclined toward the head, or in other words, the re- 

 spective intervertebral foramena throu^^h which the nerves pass 

 are slightly more cephalad than the levels at which their dorsal 

 and ventral roots come together on 

 the periphery of the cord. Along 

 the middle third of its length the 

 nerves are attached more approx- 

 imately at right angles to the axis 

 of the cord. As in the ostrich, 

 the spinal cord occupies the entire 

 vertebral canal and there is no 

 Cauda equina. The sacral and 

 coccygeal nerves are arranged so 

 that their respective foramena are 

 but little caudad to the points of 

 attachment of their dorsal and ven- 

 tral roots. 



In consequence of the angles at 

 which the nerves are attached to 

 the cord, the fila radicularia of the 

 dorsal and ventral roots of all the 

 spinal nerves fray along the sur- 

 face of the cord in both directions. 

 The fila of each root form cephalad 

 and caudad divisions of the root, 

 which divisions, increasing as they 

 course along their respective lines 

 of insertion, approach each other 

 and fuse to forni the root ( see 

 Fig. 2, ventral root). 



As to the arrangement of their 

 fila radicularia and their angles of 

 attachment, the spinal nerves of the emu 



/•V's'- I ■ The 23rd and 24th seg- 

 ments of tlie spinal cord of the 

 emu, dorsal aspect. Dura mater 

 intact. Xr. — nerve roots ; Lcp. — 

 Ligamenta epiduralia. Natural 

 size after formalin. 



differ from those 



