M. SUPINATOR LONQUS. 265 



DV. BREVTS. 



688. Synonymy. The ancone interne of S.-D., A, II, 351 ; the fifth division of the 

 triceps, Mivart, B, 149. 



Figures. Ental aspect (75) ; origin area (70, 71). 



Origin. By fleshy or short tendinous fibers from the ectal sur- 

 face of the osseous bar which encloses the Foramen epitrochleare, 

 as far as the origin area of the pr (motor teres upon the epitrochlea. 



Insertion. By fleshy fibers into the caudal border of the olecra- 

 non, just distad of the furrow for the insertion of the meditriceps. 



DV. CEPHALICA. 



689. Synonymy. The ancone exteme, S.-D., A, II, 350 ; the anconeus, Miv., B, 149. 

 Figures. Indistinctly (75) ; origin area (71). 



Exposure. The strong fascia upon the cephalic surface of the 

 elbow must be removed. 



Origin. By fleshy fibers from the elongated triangular surface 

 upon the distal half of the dorsal surface of the humeral shaft. 

 The cephalic limit of the area is indicated by the prominent ridge 

 which extends obliquely distad from the middle of the dorsal sur- 

 face to the epicondyle. The caudal border extends more nearly in 

 the line of the axis of the bone. 



Insertion. By fleshy fibers upon the cephalic side of the olecra- 

 non, from the insertion of the middle division to a point opposite 

 the distal lip of the greater sigmoid notch, which is just distad of 

 the epicondyle. The insertion area is about 2 cm. long. 



The ental surface of the muscle is attached to the capsule of the 

 elbow joint, but its thickness indicates that it serves some other 

 purpose than that suggested by Straus-Durckheim, namely, to keep 

 the capsule tense. 



M. SUPINATOR LONGUS. 



690. Synonymy. The human supinator longus, G., A, 415, Q., A, I, 215 ; u long 

 supinateur," S.-D., A, II, 356 ; " long supinateur," Ch., A, 289 ; long supinator, Ch. (Fl.), 

 A, 272 ; supinator longus, Miv., A, 151. 



Figures. Cephalic aspect (74) ; caudal aspect (75) ; origin line (71). 



Posture. The arm may rest upon the caudal surface most of 

 the time, but must be held in various positions at different stages 

 of the dissection. 



Exposure. Divide the skin and the ectal fascia from the epi- 

 condyle to the wrist, and girdle the arm between the Eminentia 



