420 MUSCLES. 



olecranon, on the outer part of the upper end of the ulna, and 

 into the triangular depression found there; so as to fill it up. 

 It extends the fore arm. 



SECT. IV. OF THE MUSCLES OF THE FORE ARM. 



There are eight muscles on the front of the fore arm, some 

 of which are superficial, and others deep-seated. They, for the 

 most part, are either directly or indirectly flexors of the fore 

 arm and hand, and in their origin adhere very much by the ten- 

 dinous partitions, called Inter-muscular Ligaments. 



1. The Pronator Radii Teres, 



Is just beneath the fascia of the fore arm, and forms the ra- 

 dial side of the muscles of the internal condyle. It arises, 

 fleshy, from the anterior face of the internal condyle of the os 

 humeri, and tendinous from the coronoid process of the ulna. 

 It passes very obliquely across the fore arm, at the internal edge 

 of the brachialis internus muscle, and is inserted, tendinous and 

 fleshy, into the external back part of the radius, just below the 

 insertion of the supinator radii brevis, occupying about two 

 inches of the middle of the bone. 



It rolls the hand inwards.* 



2. The Flexor Manus vel Carpi Radialis, 



Is placed at the ulnar side of the last muscle, and is also su- 

 perficial. It arises, by a narrow tendon, from the lower front 

 part of the internal condyle of the humerus, fleshy from the in- 

 ter-muscular ligaments, fascia, and from the upper part of the 

 ulna. It forms a thick fleshy belly, terminating below in a ten- 

 don, which passes under the anterior annular ligament of the 

 wrist, and runs through a groove in the os trapezium. 



It is inserted, tendinous, into the base of the metacarpal bone 

 of the fore finger, in front. 



* Varieties. Sometimes it is double. 



