78 



DISSECTION OF THE HAND. 



Flexor 

 brevis 

 pollicis. 



though it projects on its outer side. Along its inner border is thj 

 flexor brevis pollicis. 



Action. It draws the metacarpal bone inwards over the pain: 

 rotating it at the same time, so as to turn the ball of the thumV 

 towards the fingers, thus producing the movement of opposition. 



The FLEXOR BREVIS POLLICIS (c) arises from the lower borde: 

 of the outer part of the annular ligament, and is inserted into thi 

 outer margin of the base of the first phalanx of the thumb ; its 



Flexor carpi radial is. 



Flexor carpi 

 ulnaris. 



Abductor minimi 

 digiti. 



Opponens minimi 

 digiti. 



Palmar interossei. 



Adductor trans- 

 versus. 



Opponens minimi 

 digiti. 



Flexor brevis 

 minimi digiti. 



Interossei. 



Flexor profundus 

 digitorum. 



W 



Abductor pollicis. 

 Opponens pollicis, 



Deep head flexor 

 brevis polliciss. 



Part of first dorsal 

 interosseus. 



Opponens pollicis. 



Adductor obli- 

 quus (encircled 

 by ring). 



Flexor Ipugus 

 pollicis. 



Dorsal interossei. 



Flexor stiblimis 

 digitorum. 



FIG. 32. THE BONES OF THE HAND SHOWING THE MUSCULAR ATTACHMENTS. 



outer head 



bone; 



relations 



use. 



tendon contains a sesamoid bone close to its insertion. It lies along 

 the inner border of the opponens pollicis, and is superficial to the 

 tendon of the long flexor. 



Action. The muscle bends the metacarpo-phalangeal joint, and 

 assists the opponens in drawing the thumb forwards and inwards 

 over the palm. 



* An inner head of the flexor brevis is commonly described as a .small 

 slip, which is concealed by the adductor obliquus pollicis, and which will be 

 subsequently seen to pass from the ulnar side of the first metacarpal bone to 

 be inserted ^into the first phalanx with that muscle. It belongs, however, to 

 the same plane of muscles as the adductors, and will be described with the 

 adductor obliquus pollicis. 



