The Bones. 



1 1 



The Cavities of the Skeleton. Examine the cavity of the skull. If 

 the class has not a skull which has been sawed across, look into the 

 skull cavity through the hole where the spinal cord joined the brain. 



Neural Arch 



Transverse Process 



Neural Ring 

 Fig. 7. Upper View of Lumbar Vertebra. 



Body 



Spinous 

 Process 



Posterior Articular Process 

 Fig. 8. Side View of Lumbar Vertebra. 



Observe the conical shape of the chest. In the entire body the 

 bones and muscles about the shoulders usually make a reversed cone of 

 the upper part of the trunk. 



Observe that the ribs are connected with the breastbone by carti- 

 lages. 



The upper limbs are jointed with the body only where the inner 

 ends of the collar bones join the breastbone. 



