226 



MUSCLES OF THE UPPER LIMB. 



The flexor brevis pollicis arises by two heads, a superficial and a deep. 

 The superficial head is attached to the outer two-thirds of the annular 



Fig. 186. 



Fig. 187. 



Fig. 186. MUSCLES AND TENDONS OF THE 



PALMAR ASPECT OF THE HAND. ^ 



A portion of the tendons of the superficial 

 flexor has been cut away to show those of the 

 deep flexor and the lu rubricates. 1, tendon of 

 the flexor carpi radialis, cut short near the 

 place where it enters the canal in the outer 

 attachment of the annular ligament of the 

 carpus ; 2, tendon of the flexor carpi uluaris, 

 inserted into the pisiform bone ; 3, anterior 

 annular ligament of the carpus ; 4, abductor 

 pollicis ; 5, opponens pollicis ; 6, 6, flexor 

 brevis ; 7, adductor pollicis ; 8, abductor 

 minimi digiti ; 9, flexor brevis minimi digiti ; 

 10, lumbricales, passing to their insertion on 

 the radial side of the four fingers. 



ligament and to the os magnum : the 

 deep head is attached to the os trape- 

 zoides and os magnum, to the sheath 

 of the flexor carpi radialis, and to the 

 bases of the second and third meta- 

 carpal bones. From the superficial and 

 deep heads of origin two strong masses 

 of fibres proceed which, becoming tendi- 

 nous, are attached to the outer and inner 

 sesamoid bones respectively, and are 

 inserted into the sides of the base of 

 the first phalanx of the thumb ; the 

 outer head is also joined by a con- 

 siderable fasciculus from the deeper 

 origin ; the inner head is inserted con- 

 jointly with the adductor pollicis. The 

 two tendons of insertion, with the sesa- 



Fig. 187. DEEP MUSCLES OF THE PALM OF 

 THE HAND. ^ 



The abductor pollicis and abductor minimi 

 digiti, together with the anterior annular 

 ligament and the long flexor tendons in the 

 palm, have been removed ; in the fore-finger 

 the tendons of both the superficial and deep 

 flexors remain ; in the other fingers the ten- 

 dons of the superficial flexor have been 

 removed. 1, pronator quad rat us muscle ; 

 2, opponens pollicis ; 3, flexor brevis pollicis; 

 4, adductor pollicis ; 5, opponens minimi 

 digiti ; 6, unciforra bone ; 7, 8, interosseous 

 muscles. 



moid bones, play over the grooved surfaces of the first metacarpal bone. 

 The tendon of the long flexor lies between the heads of origin, and grooves 

 the surface of the muscle as it passes between the tendons of insertion. 



The adductor pollicis arises from the anterior two thirds of the palmar 

 surface of the metacarpal bone of the middle finger, and is inserted into the 



