THE UPPER LIMB 



385 



ment, where it occupies the groove between the radius and ulna, 

 the tendon divides into two parts, the outer part being joined by the 

 common extensor tendon to the httle finger, or by its inner division. 

 Both parts end in a broad expansion on the back of the first phalanx, 



Biceps ■ 



"^^^ 



Brachio-radialis- 



/ 



^■. -^'~r -Triceps 



Extensor Carpi Radialis Longior— - — 



Extensor Carpi Radialb Brevior 



Extensor Ossis Metacarpi Pollids 

 Extensor Brevis Pollicis 

 Extensor Longus Pollicis 



extensor Carpi Radialis 

 Longior 

 Extensor Indicis 



hi: 



1) U '" 



Anconeus 



T15& Extensor Carpi 



Ulnaris 



Extensor 



Communis 



Digitorum 



.-Extensor Carpi Ulnaris 



UL Extensor Minimi Digit! 



'Ll^ Posterior Annular Ligament 



Extensor Carpi Radialis 

 Brevior 



Extensor Minimi Digit! 



(in two parts) 

 Connecting Band 



Fig. 205. — The Muscles of the Radial Side and Back of the 

 Forearm. 



and the ultimate insertion is as in the case of the common extensor 

 tendons. 



Nerve-supply. — ^The posterior interosseous nerve. 



Action. — ^The muscle is the special extensor of the little finger, 



25 



