MUSCLES OF THE HAND. 



87 



ulna below its middle, and from the interosseous ligament. Inser- 

 tion^ into the first phalanx of the thumb. 



Extensor major pollicis manus.^* — Origin, from the back of the 

 ulna above its middle, from the interosseous ligament, and from the 

 back of the radius. Ifisertion, into the base of the second phalanx 

 of the thumb. Use; these last three extend the thumb. 



Indicator.— Origin, from the back of the ulna, and interosseous 

 ligament. Insertion, into the base of the first phalanx of the index 

 finger. Use; it extends the tore-finger. 



MUSCLES OF THE HAND. 



Palmaris brevis. — Origin, from the anterior ligament of the 

 wrist, and palmar aponeurosis. Insertion, into the skin at the inner 

 edge of the hand. Use; it contracts the skin. 



Lmnhricales? — These are four 

 in number, and resemble earth- Fis- 68. 



worms. Origin, from the ten- 

 dons of the flexor profundus. 

 Insertion, into the radial side of 

 the base of the first phalanx of 

 each finger. Use; they assist in 

 bending the fingers. (Fig. 68.) 



Abductor pollicis manus? — 

 Origin, from the annular liga- 

 ment, trapezium, and scaphoid 

 bones. Insertion, into the base 

 of the first phalanx of the thumb. 

 Use; draws the thumb from the 

 fingers. 



Opponens pollicis.^ — Origin, 

 from the trapezium and annular 

 ligament. Insertion, into the ra- 

 dial edge of the metacarpal bone, 

 from its base to its head. Use; 

 it draws the metacarpal bone in- 

 wards. 



Flexor brevis pollicis nianus^ ^ — It consists of two bellies, 

 external arises from the trapezium and trapezoides, and the annular 

 ligament, and is inserted into the outer side of the first phalanx of 

 the thumb. The internal head arises from the magnum and unci- 

 form, and the metacarpal bone of the Httle finger, and is inserted 

 into the inner side of the base of the first phalanx of the thumb. 

 The sesamoid bones are included in these tendons. 



Adductor pollicis manus.^ — Origin, from the metacarpal bone of 

 the middle finger between its base and its head. Insertion, into the 

 base of the first phalanx of the thumb. Use; it draws the thumb 

 towards the fingers. 



The 



