MUSCLES OF THE ANTERIOR LIMBS. 



273 



Fig. 125. 

 B. C. 



D. 



MUSCLES OF THE FORE-ARM AND PAW OF THE DOG. 



A. Anterior superficial region. 1, Short flexor of the fore-arm (anterior brachial); 

 2, Long flexor of the fore-arm (brachial biceps) ; 3, Anconeus ; 4, Round pronator ; 

 5, Anterior extensor of the metacarpus (external radial) ; 6, Its tendon of inser- 

 tion, destined for the fourth metacarpal bone ; 7, That which goes to the third ; 

 8, External oblique of the metacarpus (long abductor and short extensor of the 

 thumb) ; 9, Common extensor of the digits ; 9', Its terminal tendon at the point 

 where it divides into four branches ; 10, Proper extensor of the three external 

 digits, or lateral extensor of the phalanges in the Horse ; 10', Its terminal tendon 

 at the commencement of its trifurcation ; 11, Proper extensor of the thumb and 

 index ; 11', Its terminal tendon ; 12, 12, Long supiuator ; 13, External flexor of 

 the metacarpus (posterior ulnar). 



B. Deep anterior region. 1, Round pronator; 2, Short supinator ; 3, Proper extensor 

 of the thumb and index ; 4, Oblique extensor of the metacarpus ; 5, Superior 

 insertion of the anterior extensor of the metacarpus ; 6, Ditto of the anterior 

 extensor of the phalanges ; 7, Proper extensor of the three external digits ; 8, 

 Internal flexor of the metacarpus (great palmar); 9, Levator humeri ; 10, 11, 

 Long and short flexors of the fore-arm. 



C. Deep posterior region. 1, Round pronator; 2, Square pronator; 3, Ulnar portion 

 of the perforans ; 4, Radial portion of the same (long flexor of the thumb) ; 5, 

 Terminal tendon of the same ; 6, Tendon of the small palmar (division of the 

 perforans) ; 7, Anterior extensor of the metacarpus ; 8, Long supinator ; 9, 

 Epicondyloid insertion of the perforatus, perforans, and oblique and internal 

 flexors of the metacarpus; 10, Olecranian insertion of the oblique flexor; 11, 

 Supercarpal insertion of the same; 12, Terminal tendon of the internal flexor; 

 13, Proper extensor of the external digits ; 14, Coraco-radialis ; 15, Tendon of 

 the extensors of the fore-arm. 



D. Superficial posterior region, and the special muscles of the foot or hand. 1, Perfo- 



