PLATE XI. 



CERVICAL VERTEBRAE. 



Five times natural size. 

 Fig. i. Atlas, posterior aspect. * 

 Fig. 2. Atlas, anterior aspect. 

 Fig. 3. Atlas, dorsal aspect. 



Figs. 4-6. Seventh cervical from different individuals showing variation in form 

 and occurrence of vertebrarterial foramina. 



Fig. 7. Axis, left lateral aspect. 



a.z., anterior zygapophysis; 

 h.t., hypapophysial tubercle; 

 i.v., intervertebral notch; 

 l.s., lamina of spinous process; 

 n.f., nutrient foramen; 

 o.p., odontoid process; 

 p.p., pleurapophysis or cervical rib; 

 p.z., postzygapophysis; 

 tr., transverse process; 

 v.c., vertebrarterial canal; 

 v.c.g., vertebrarterial canal reduced to a groove. 



