DISSECTING MANUAL. 



quadratus; corresponding part of interosseous membrane. 

 Insertion ; terminal phalanx of thumb. [343] 



Pronator Quadratus. Origin; lower fourth of anterior bor- 

 der and surface of ulna. Insertion; lower fourth of anterior 

 surface of radius. [344] 



Short Muscles of Hand. 



Abductor Pollicis. Origin; anterior annular ligament; 

 ridge on trapezium. Insertion ; outer side of first phalanx of 

 thumb; capsule of metacarpo-phalangeal joint. [345] 



Opponens Pollicis. Origin; (under preceding) anterior an- 

 nular ligament; ridge on trapezium. Insertion; whole an- 

 terior surface of first metacarpal. [345] 



Flexor Brevis Pollicis. Superficial part: Origin; anterior 

 annular ligament : Insertion ; outer side of base of first phalanx 

 of thumb, developing a sesamoid bone. Deep part: Origin; 

 ulnar side of base of first metacarpal: Insertion; inner side 

 of base of first phalanx of thumb. [345] 



Adductor Obliquus Pollicis. Origin; anterior surfaces of 

 trapezium, trapezoid, and os magnum; tendon of Flexor 

 carpi radialis; bases of second and third metacarpals. 

 Insertion; inner side of base of first phalanx of thumb, 

 developing a sesamoid bone; outer side of base of first 

 phalanx of thumb, by a slip from the outer border of the 

 muscle. [346] 



Adductor Transversus Pollicis. Origin; lower two-thirds 

 of front of first metacarpal. Insertion; inner side of base of 

 first phalanx of thumb. [346] 



Abductor Minimi Digiti. Origin; pisiform bone; tendon of 

 Flexor carpi ulnaris. Insertion ; inner side of base of first pha- 

 lanx of little finger. [347] 



Opponens Minimi Digiti. Origin; anterior annular liga- 

 ment; hook of unciform. Insertion; whole inner margin of 

 fifth metacarpal. [347] 



Flexor Brevis Minimi Digiti. Origin; anterior annular liga- 



[172] 



