THE VKRTKHR.E 



23 



The anterior segment of the atlas is most probably an enlarged hypapopliysls or subvertebral 

 wedge-bone, which, in lizards, exists on the ventral aspect of the column oetween individual 

 centra. Siujilar ossicles occur in the lumbar region of the mole. (Froriep regard.s this segment 

 as the ossified primitive ventral arch which precedes the body and which disappears after the 

 formation of the latter in all the other vertebrae.) 



Fig. 29.— Morphology of the Transverse and Articular Processes. 



CERVICAL 

 VERTEBRA 



TRANSVERSE PROCESS 

 COSTO-TRANSVERSE FORAMEN 



NEURO-CENTRAL SUTURE 

 CERVICAL RIB 



COSTAL PROCESS 



TRANSVERSE PROCESS 

 COSTO-TRANSVERSE FORAMEN 



NEURO-CENTRAL SUTURE 

 RIB 



TRANSVERSE PROCESS 

 LUMBAR RIB 



SACRAL 

 VERTEBRA 



NEURO-CENTRAL SUTURE 

 COSTAL PROCESS 



The neural arches and spinous processes are easily recognised throughout the various parts of 

 the column in which complete vertebrfc are present. _ . . , 



The articular processes are of no morphological value, and do not require consideration here. 



The transverse processes offer more difficulty. They present themsolve.? in the simplest form 

 in the thoracic series. Here they articulate with the tubercles of the ribs. The transverse pro- 



