i8o 



PR A CTICAL ANA TOM\ '. 



the above muscles well aside. You will sec the radial artery lying on its outer 

 part ; the ulnar artery and median nerve above, passing behind the arch connect- 

 ing the two heads of the flexor sublimis digitorum muscle. This muscle has three 

 heads: (l) A condylar, arising from the inner condyle of the humerus ; (2) a 



Biceps 



iuecles of the first and second 

 layers 



Flexor profundua digitorum 



Pronator quadratic 



Flexor carpi ulnaris 



Brachio-radialis 



Brachialis anticus 



Extensor carpi radialis loiigior 

 Suplnator brevis 



Flexor longus pollicis 



Brachio-radialis 



Extensor ossis metacarpi pollicis 



Extensor brevis pollicis 



FIG. 125. FRONT OK TIIK FOREARM: THIRD LAYER OF MUSCLES. 



coronoid, from the coronoid process of the ulna ; (3) a radial head, from the 

 oblique line of the radius. (Fig. 124.) Cut the radial origin, and turn the 

 muscle toward the ulna, without injury to the radial artery, and see ; (i) The 

 median nerve, on the under surface of the muscle; (2) the insertion of the 

 brachialis anticus muscle into the base of the coronoid process of the ulna; (3) 



