THE SKELETON 



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The Lumbar Vertebrae (Fig. 22) are the largest of all the mov- 

 able vertebra and have no ribs attached to them. Their spines 

 are short and stout and lie in a more horizontal plane than those of 



4 



FIG. 22. A lumbar vertebra, seen from the left side. Ps, spinous process; 

 Pas, anterior articular process; Pai, posterior articular process; Pi, transverse 

 process. 



FIG. 24. 

 The coccyx. 



FIG. 23. The last lumbar vertebra and the sacrum seen from the ventral side. 



the vertebrae in front. The articular and transverse processes are 

 also short and stout. 



The Sacrum, which is represented along with the last lumbar 



