THE ANATOMY OF THE ELK. 381 



whicli is attached to the outer side of the external condyle of the humerus, 

 and the other to the outer surface of the radius 3 inches below the olecra- 

 non. The first head ends on two tendons, of which the stronger passes 

 downwards in front of the metacarpo-phalangeal articulation, lying between 

 the two tendons of the preceding muscle, below the expansion of which it 

 divides into two slips, each of which is inserted into the terminal phalanx 

 of an anterior toe. The other and smaller tendon passes down to be in- 

 serted into the last phalanx of the inner of the two posterior toes. The 

 second head terminates in a tendon which unites with that of the long ex- 

 tensor opposite the wrist-joint. 



Note. — The anterior and long extensors have been thus described for 

 the sake of clearness. With reference to their action, they may be re- 

 garded as different parts of the extensor pedis of veterinarians. 



Posterior Radio-ulnar Region : Flexors. 



External Flexor of Metacarpus arises by means of a stout tendon from 

 the posterior border of the external condyle of the humerus. It passes 

 along the outer and posterior aspect of the forearm, and is inserted by 

 means of a tendon common to it and to the following muscle into the pisi- 

 form bone, as well as into the proximal extremity of the great metacarpal 

 bone. 



Oblique Flexor of Metacarpus. — This muscle originates by two heads, 

 one from the inner side of the olecranon, and the second from a depression 

 on the inner side of the internal condyle of the humerus. These two heads 

 unite upon a tendon which blends with that of the preceding muscle and 

 is inserted along with it. 



Internal Flexor of Metacarpus (Palmaris magnus) arises from the inner 

 condyle of the humerus, below the origin of the oblique flexor, and termi- 

 nates on a rounded tendon, which is inserted into the inner and posterior 

 border of the proximal end of the great metacarpal bone. 



Flexor sublimis Digitorum arises together with one of the heads of 

 origin of the flexor profundus from the posterior border of the inner 

 condyle of the humerus. The muscular fibres terminate at the lower end 

 of the forearm in two tendons which pass along the whole length of the 

 metacarpal bone, and are perforated opposite the metacarpo-phalangeal 

 articulations for the transmission of the corresponding deep flexor tendons. 

 Each is inserted by means of two slips into the base and sides of the second 

 phalanx of each of the two anterior toes. Behind the wrist-joint this 

 muscle is connected by means of two tendinous slips to the tendon of the 

 deep flexor on its inner side and to the pisiform bone on its outer side. 



Flexor profundus Digitorum arises by two heads, an inner and an 



outer. The inner head is the stronger, and arises in common with the 



flexor sublimis, whilst the outer head is attached to the inner side of the 



« olecranon process. The inner head of the muscle, moreover, is more or 



less divisible into two parts. These end behind the wrist on a single 



