i So Mujcles of tie [Book IX. 



The flexor longus pollicis manus, which originates 

 from the upper and fore part of the radius j its tendon 

 paiTes under the ligament of the wrift, and isinferted into 

 the laft joint of the thumb, which it ferves to bend. 



The extenfor oflis metacarpi pollicis manus, which 

 arifes from the middle and pofterior part of the ulna, 

 from the middle and pofterior part of the radius, and 

 from the interofleous ligament. It is inferted into the 

 os trapezium and upper back part of the metacarpal 

 bone of the thumb. Ics effect is to extend the meta- 

 carpal bone of the thumb outwardly. 



The extenfor primi internodit arifes from the pofterior 

 part of the ulna, and from the interofleous ligament. 

 It is inferred into the pofterior part of the firft bone 

 of the thumb, which it extends obliquely outwards. 



The extenfor fecimdi internodii, arifes from the- 

 middle and back part of the ulna, and from the inter- 

 ofTeous ligament, and is inferted into the laft bone of 

 the thumb, which it extends obliquely backwards. 



To the fore-finger brlongs 



The indicatbr, which begins from the pofterior part 

 of the -ulna, about the middle of that bone. Its ten- 

 don, accompanying that of the extenfor digitorum 

 communis, which belongs to the fame finger, they arc 

 inferted together into its upper part. Its effect is to 

 extend the fore-finger, whence its name of indicator, 

 as that is the finger with which we ufually point at any 

 object of attention. 



The mufcles feated in the hand may be divided 

 into thofe of the thumb and thofe of the fore and little 

 fingers. 



The flexor brevis pollicis manus. arifes from the os 

 trapezoides, annular ligament, os magnum, and os un- 

 ciforme, and is inferted into the fecond joint of the 

 thumb, which it ferves to bend. 



The 



