784 



MR. ST. GEORGE MIVART ON THE 



[June 27, 



pronator teres. It is inserted into the carpal bone, which articulates 

 with the radius, and also by a small tendon running on (figs. 6 & 1 2) 

 into the radial side of the metacarpal of the poUex. 



Fig. 11. 



Deep muscles of extensor surface of riglit forearm. 

 E. C. Extensor communis digitorum. E. C. U. Origin of extensor carpi ulnaris 

 and common insertion of extensor and flexor carpi ulnaris. E. M. P. Ex- 

 tensor ossis metacarpi poUicis. S. L. Supinator longus. P. Q. Pronator 

 quadratus. 



Fis:. 12. 



Deep muscles of flexor surftice of right forearm, the flexor carpi radialis, flexor 

 carpi ulnaris, and flexor profundus digitorum being cut and reflected. 



B. Biceps. F. C. E. Flexor carpi radialis. F. C. U. Flexor carpi ulnaris. 

 F.P.D. Flexor profundus digitorum. P. A. Pronator accessorius. P. Q. 

 Pronator quadratus. P. T. Pronator teres. *S. .^. Supinator accessorius. 

 S. L. Supinator longus. 



Pronator accessorius (fig. 12, P. A.). A muscle I so name provi- 

 sionally, arises from the anterior surface of the internal condyle, 

 immediately beneath the humeral origin of the flexor profundus digi- 

 torum. It is inserted into the radius between the insertion of the 

 pronator teres and that of the pronator quadratus. 



