132 THE MYOLOGY OF THE RAYEN. 



from above downwards, and its tendon of origin is seen 

 to spread out over its proximal moiety on either side. 

 In addition to its being a powerful muscle of pronation, 

 it may act also as a flexor of the forearm upon the 

 arm. 



78. The 'pronator longus^ i^ even a stronger muscle 

 than the preceding, and possesses considerably more 

 bulk. It comes off by a strong tendon from the middle 

 of the internal condyle of the humerus, its fibres 

 forming a massive ellipsoidal muscle, which, passing 

 parallel to the pronator hrevis, is inserted into the shaft 

 of the radius, just beneath that muscle and rather pos- 

 terior to it. The jyronator longus is in intimate relation 

 with the hrachialis a^iticus, the flexor digitorimi 2?ro- 

 fundus, and other muscles lying beneath it. Its action 

 is much the same as we described for the short pronator 

 in the last paragraph. 



79. The extensor ossis 7netacarpipolUeis'^i^,hyii\\ 



^ See footnotes under No. 77, antea. 



2 I fail to find this muscle exactly described by Gadow as I have 

 it here, and, as I say under its description above, it may be the ext. 

 vietacarjji radialis brev. of Tiedemann, Watson, and others. 



However this may be, Gadow, I see, desciibes the following (Joe. 

 cit., pp. 283, 284) :— 



" 93. M. EXTENSOR POLLICIS LONGUS. 



Le radial grele. Vicq d'Azyr, 1773, p. 574, No. 2. 

 Vorderer Handanleger. Merrem, p. 157, No. 4. 

 Hiilfsmuskel des Mittelhandstreckers. Wiedemann (1). 

 Extensor metacarjn radialis hrevis. Tiedemann, § 269. 



,, ,, ,, „ Heusinger, ]). 187, No. 23. 



,, ,, ,, ,, Schtipss, p. 148, No. 32. 



„ ,, „ ,, Watson, p. 95. 



Kurzer Speichenstrecker. Meckel, p. 334, No. 2. 

 Extensor pollicis longus. Elidinger, p. 131. 



,, ,, „ Selenka, p. 133, No. 63. 



„ „ „ De Man, No. 27, Carlsson, p. 23. 



