DISSECTION OF THE DOG 131 



between the muscles. Four tendons leave the tapering end of the muscle, play 

 through a groove at the distal end of the radius, and spread out on the dorsum 

 of the manus. The tendons are finally inserted into the terminal phalanges 

 of the second, third, fourth, and fifth digits. 



\ 



A -A m. triceps orachii 



v\Av' r 



' -J ; ' __-n. medianvs 



.,.- . n. ulnaris 



m. biceps oraehu 



I /^ " V\ \\ m. pronator teres 



I '" ^1\ : \ 



iff^ 1 \ \ „ - °" mterossea communis 



m. supinator- ^jf_ 



^ .'**'£ n^ " i "~^- m. flexor carpi ulnaris 



m. extensor carpi.*-- <'■ Il\ \ ' * 



radialis / ^ ^ ~ "" "" ~ - -~ ., _ m. flexor carpi radialis 



a, mediawa,""^ 



M *-~m. pronator quaaratus 



iff/ -Mtinh'lilr '''/ m, flexor digitorum 



i 'If ~l 'r'il '-'-■-— sublimit 



I? Ik 

 it -I' 



- «. ulnaris 



■ # 



m. flexor digitorum 



profundus 



>Hl/f 

 a. radialis j * — M, if f j III 



m. flexor digitorum _ _ +j — 4^v III jiff 

 profundus. Caput radiale jf Ijn ' I III It iff 



^l/f/iii' 



Pig . 49. — Dissection of the medial aspect of the forearm. 



Each tendon expands over the metacarpophalangeal articulation, with 

 the capsule of which it is closely connected, and has a sesamoid bone over the 

 proximal interphalangeal joint. In the neighbourhood of the joint between the 

 metacarpal bone and the first phalanx, each tendon is joined by the tendon of 

 one of the smaller extensors of the digit — -extensor indicia proprius, extensor 

 digiti tertii et quarti, and extensor digiti quinti. At the distal end of 



k2 



