The; Vertebrae Column. 



69 



tion of^the body bears on either side the pedicle, or root of the vertebral 

 arch .(radix arcus vertebrae), the dorsal surface of the body forming 

 in this-ltfay the floor of the vertebral foramen. The dorsal portion of 

 the arch, borne on the pedicle, is distinguished as the lamina. The 

 anterior and posterior margins of the pedicle are notched, each notch 



p.a.i 



Fig. 27. Representative vertebrae: A, atlas, anterior surface; B, epistropheus, 

 lateral surface; C, fifth cervical vertebra, anterior surface; D, fourth dorsal, lateral 

 surface; E, F, second lumbar vertebra, anterior and lateral surfaces. 



a.a., anterior arch of atlas; a.p., posterior arch of atlas; a. v., vertebral arch; c.v., 

 vertebral body; d., dens epistrophei; f.a.a., anterior articular facet of epistropheus; 

 f.a.s., superior articular pit of atlas; f.a.s. 1 ., superior articular facet of epistropheus; 

 f.c.i., inferior costal demifacet for head of rib; f.c.s., superior costal demifacet; f.c.t., 

 costal facet of transverse process;' f.d., fovea dentis; f.i., intervertebral foramen; 

 f.tr., foramen transversarium ; f.v., foramen vertebrale; 1., lamina of vertebral arch; 

 m.l., lateral mass of atlas; p.a., accessory process of lumbar vertebra; p.a.i. inferior 

 articular process; p.a.s. superior articular process; p.m., mammillary process; p.s., 

 spinous process; p.s. a., anterior spinous process; p.t., transverse process; p.tn., trian- 

 gular process; r. radix of vertebral arch; r.a., r.p., anterior and posterior radices of 

 transverse process of cervical vertebra; t.a., t.p., anterior and posterior tubercles of 

 atlas. 



or incisure being converted, through its association with that of the 

 adjacent vertebra, into a rounded aperture, the intervertebral foramen 

 (foramen intervertebrale), for the passage outward of a spinal nerve. 



