242 THE UPPER LIMB IN MAN. 



length ; his power of extending his shoulder joint reach in 

 breadth ; by means of his hand he can grasp in all the 

 relations of space. 



11. Finally, in reference to completeness of the human 

 skeleton with the joints and muscles, man is not only alone 

 in his erect position, but he alone can lay himself in the 

 prone and the supine positions. This he is enabled to do by 

 the antero-posterior compression of his thorax. 



