72 



Bones of the Trunk. 



92. The Eleventh and Twelfth Ribs, Costae fluctuantes. 



The eleventh and twelfth ribs end free and are of all the ribs 

 the two most moveable; they have a round head with a single articular 

 facet. The tubercle and neck are wanting in both, the rough line for- 

 ming the Angulus costae only slightly marked. Their cartilages are very 

 short, round and pointed. The twelfth rib is the shortest of all. 



