890 



5767. The axis vertebra, vertically and longitudinally bisected. 



The line of the obliterated harmonia between the odontoid and the body of the axis is in- 

 dicated by the inward extension of the compact wall, and the structure of the odontoid pro- 

 cess is denser than that of the body of the axis. 



Prepared in 1851. 



5768. The fifth cervical vertebra, vertically and longitudinally bisected. 



The structure of the spine is denser than that of the body. 



Prepared in 1851. 



5769. The seventh cervical vertebra, vertically and transversely bisected. 



The compact layer of bone immediately surrounding the neural canal is thickest above and 



laterally. 



Prepared in 1851. 



5770. A similar preparation, showing the same structure. Prepared in 1851. 



5771. A middle dorsal vertebra, vertically and longitudinally bisected. 



It shows the thick, compact walls of the spine, and the vascular canal continued from the 

 neural canal into the cancellous structure of the body. 



Prepared in 1851. 



5772. The twelfth dorsal vertebra, vertically and transversely bisected. 



It shows the thick compact anterior wall of the spine and the vascular canal of the 



centrum. 



Prepared in 1851. 



5773. The second lumbar vertebra, vertically and longitudinally bisected. 



The compact wall of the spine is thickest at its base : the cancellous structure is more open 

 than in the preceding vertebrae. 



Prepared in 1851. 



5774. The second lumbar vertebra, vertically and transversely bisected. 



It shows the great thickness of the compact walls which form the roof of the neural canal 

 and the base of the spine. In this section the walls of the cancelli of the centrum manifest 

 a tendency to a radiate disposition, diverging towards the periphery. 



Prepared in 1 8 5 1 . 



5775. The fourth lumbar vertebra, vertically and transversely bisected. 



It shows the large proportion of the compact tissue at the roof of the neural canal and the 

 base of the spine. 



Prepared in 1851. 



