MUSCLES OF THE THORACIC LIMBS. 



Its very thick tendon forms the middle and deep part of the 

 common tendon. 



The common tendon (Fig. 88, r') 

 covers the carpus and metacarpus ven- 

 trally. It divides into five tendons (c) 

 which pass to the five digits and are in- 

 serted into the bases of the terminal 

 phalanges. Those of the first four digits 

 perforate the tendon of the flexor sublimis 

 (b] at the base of the first phalanx of each 

 digit. At the same place each passes 

 through a fibrous pulley-ring attached to 

 the base of the phalanx. Each then passes 

 through a second pulley-ring (2) near the 

 head of the phalanx and is finally inserted 

 into the base of the terminal phalanx. 



Relations. Outer surface with the 

 pronator teres (Fig. 77, </), flexor carpi 

 radialis (Fig. 77, r), palmaris longus (s~), 

 flexor carpi ulnaris (/), integument, and F 

 extensor carpi ulnaris (Fig. 75, <?). Inner 

 surface with the radius, ulna, interosseous 

 membrane and pronator quadratus (Fig. 



87, ) 



Action. Flexor of all the digits. 

 M. pronator quadratus (Fig. 87, a). 



A thick quadrangular muscle whose its tendons) luwe been ie- 



_. 11-11 i 1-1 moved; the flexor sublimis 



fibres run obliquely between the distal nas been cut. a, cut ends 

 ends of the ulna and radius. f tendons of M. palmaris 



... longus; 0, tendons of M. 



Origin by fleshy fibres from about the flexor sublimis digitorum, 

 distal half of the ventral (flexor) surface "^ f di ^ s T : 3 ' ; dial 



part of M. flexor sublimis 



or border of the ulna and from the interos- digitorum; c, tendons of 

 seous membrane adjacent to the area. torum e ^ r thecommon t&n- 

 The fibres pass obliquely distad toward don); d, M. abductor digi- 



,, 1-1-1 i ti quinti; e. M. flexor brevis 



the radial side to their di j ti qu inti : /, Mm. lum- 



Insertion by fleshy fibres into the ven- bricales (/', their tendons). 



i. transverse ligament of 

 tral (flexor) Surface Of the radlUS diStad of wrist; 2, annular ligaments. 



the area of origin of the fifth head of the profundus. 



. ARRANGEMENT 

 OF THE TENDONS of 

 M. palmaris longus, M. 

 flexor sublimis digito- 

 rum, and M. flexor pro- 

 fundus digitorum. with 

 Mm. lumbricales. 

 The integument, fibrous 



