THE FORE EXTREMITY. 



69 



but lifts the whole shoulder bodily upwards and 

 forwards according as the nech is situated. This 

 * levator humeri' arises from the vertex of the head 

 and from the foremost four bones of the neck, also 

 through a strong elastic medium it arises from 

 the elastic ligament of the neck. After this ex- 

 tensive origin, it gets a most extensive insertion to 

 the shoulder as follows ; the spine of the scapula 

 or shoulder blade, the point of the shoulder, the 



FIG. 9. 



B 



strong outer ridge at the top of the arm bone and 

 to the arm bone at another point near its lower 

 end. 



As the free and extensive movement of the 

 shoulder mainly depends upon this muscle, and the 

 longer the belly of a muscle the greater the muscle's 

 capability for contraction, and further, as this 

 muscle is co-extensive with the neck, it follows 

 that tlie longer the neck the more extensive the shoulder 

 movement. Again, as this muscle is attached to 



