ANTERIOR ANTIBRACHIAL GROUP. 



22S 



EXTENSOR METACARPI OBLIQUUS. 



(Eadio-premetacarpeus. ) 

 (Fig. 78. h.) 



This muscle is situated on the infero- 

 anterior part of the radius, and is tri- 

 angular and penniform ; aponeurotic 

 above, it terminates in a small tendon, 

 which crosses obliquely the inferior 

 extremity of the anterior surface of 

 the radius, under the extensor pedis, 

 and over the extensor metacarpi 

 magnus tendon. 



Origin. — From the external border 

 of the radius. Its tendon passes 

 through the oblique groove on the 

 antero-intemal part of the distal end 

 of the radius, where there is a synovial 

 sheath. 



Insertion. — The head of the inner 

 metacarpal bone. 



Relation. — Anteriorly with the ex- 

 tensor pedis and the fascia ; posterior- 

 ly with the extensor metacarpi magnus 

 and the bone. 



Action. — To extend the metacar- 

 pus, and rotate it slightly, carrying 

 the inner aspect forwards. 



EXTENSOR PEDIS. 



(Epitrochleo-prephalangeus. ) 



(Fig. 78. fc; Fig. 80./.) 



Placed on the antero-external part 

 of the fore-arm, it is long and pyra- 

 midal, extending downwards ; fleshy 

 above, its belly is bifid inferiorly, and 

 ^terminates in a long tendon, which is 

 louble, and commences about the 

 ferior third of the radius. 



Fig. 80. 



External view of the muscles of the 

 anterior limb— showing the deeper 

 ones of the upper region, a a, Postea- 

 spinatus minor ; 6, Deep portioji of 

 postea-spinatus ; c, flexor brachii 

 divided, and the upper part raised ; 

 c'. Its tendon, which fits the bicipital 

 groove ; d, Humeralis obliquus ; c. An- 

 coneus ; /, Extensor pedis ; g, Thier- 

 nesse's muscle; h, Phillips' muscle;. 

 h\ Its tendon. 



