Chap. 14.3 Mufcles of tie Fore-arm, &c. 177 



taufcular fibres. This mufcle is fixed to the upper 

 and outer part of the olecfanon of the ulna. 



The anconeus arifes from the external condyle of 

 the os hurticri, and is infeirted into a ridge on the outer 

 and pofterior edge of the ulna. It affifts in extending 

 the fore-arm. 



The mufcles fittiated on the fore-arm may be di- 

 vided into four orders: I. Flexors and extenfors of 

 the whole hand. 2. Flexors and extenfors of the fin- 

 gers. 3. Supinators and pronators, or thofe which 

 roll the radius on the ulna. 4* Flexors and extenfors 

 of the thumb and fore^-finger. 



The firft order confifts of three flexors and three ex- 

 tenfors* The flexors are, 



The palmaris longus> which arifes from the inner 

 condyle of the os humeri, and is inferted partly into the 

 annular ligament, which confines the tendons feated in 

 the wrift, and partly into the tendinous expanfion, which 

 covers the palm of the hand. This mufcle bends the 

 wrift and ftretches this membrane. 



The palmaris brevis, which originates from the an- 

 nular ligament and tendinous expanfion on the palm 

 of the hand, and is inferted into the os pififorme, and 

 the fkin covering the abduclor minimi digici. It affifl;s 

 in contracting the palm of the hand* This fmall muf- 

 cle is commonly confidered as belonging to the former. 



The flexor carpi radialis proceeds frorr the inner 

 condyle of the os humeri, and is inferted into the me- 

 tacarpal bone of the fore- finger. It bends the hand 

 and afiifts in its pronation, that is, in turning the palm 

 downwards. 



The flexor carpi ulnaris arifes alfo from the internal 



condyle of the os humeri, and alfo from the outer fide 



of the olecranon. I? is inferted into the os pififorme, 



and afllfts in bending the wrift. 



VOL. III. N The 



