Skulls of Fox (left) and Otter (right) 

 (Note the forward position of the eyes on the otter) showing Carnivorous 

 Dentition. 



Gristle, which allow of elasticity. Humans are said 

 to be slightly taller in the morning than at night, be- 

 cause of the elasticity of these cartilaginous discs in 

 the Spine. On the upper surface of the Centrum is an 

 arch called the NEURAL Arch, which encloses the 

 Neural Canal, through which runs the spinal cord. 



There are five general regions of the Backbone. 

 They are: (1) the CERVICAL region or Neck, in which 

 there are usually seven vertebrae. Long-necked ani- 

 mals like the Giraffe have no more cervical vertebrae 

 than short-necked ones like the Wood-chuck. The dif- 

 ference is in the length of the vertebrae; (2) the THO- 

 RACIC region which includes the vertebrae to which the 

 Ribs are attached; (3) the LUMBAR region, including 

 the vertebrae back of the Thoracic region to the (4) 

 Sacrum, which includes a variable number (2-13) of 

 fused vertebrae, which appear as a solid structure and 

 to which the hind limbs are attached; and (5) the 

 Caudal region, including the vertebrae of the tail. 



The Appendicular skeleton consists of the Limb 

 Girdles and the bones of the Limbs and Feet. The 

 Limb Girdles are the means of attaching the limbs to 

 the body in such a way as to allow of mobility. The 



-f^ 46 >«- 



