DISSKCTIOX OF THE HAND. 



as abductors 

 and adduc- 

 tors. 



Dissection. 



Annular 

 ligament 

 of front 

 of wrist. 



The interosseous muscles also separate and approximate the 

 straightened fingers, the palmar set adducting the index, ring and j 

 little fingers towards the middle digit ; while the dorsal abduct 

 their fingers from the median line of the hand, the two fixed to 

 the middle finger moving it to either side of that line, 



Dissection. The attachments of the annular ligament to the 

 carpal bones on each side are next to be dissected out by taking ( 

 away the small muscles of the thumb and little finger. Before 

 reading its description, the ends of the cut ligament may be placed 

 in apposition, and fixed with a stitch. 



The ANTERIOR ANNULAR LIGAMENT is a broad band, which 

 arches over and binds down the flexor tendons of the fingers. It is 



FIG. 33. THE THREE PALMAR 

 INTEROSSEOUS MUSCLES. 



a. Muscle of the little finger. 



b. Muscle of the ring finger. 



c. Muscle of the index finger. 



FIG. 34. THE FOUR DORSAL 

 INTEROSSEOUS MUSCLES. 



d. Muscle of the index finger. 



e and/. Muscles of the middle finger. 



g. Muscle of the ring finger. 



attached internally to the pisiform and the hook of the imciform, 

 and externally to the tuberosity of the scaphoid and the ridge of 

 the trapezium, as well as by a deeper process to the trapezoid bone 

 on the inner side of the groove for the flexor carpi radialis. By its 

 upper border it is continuous with the aponeurosis of the forearm ; 

 and anteriorly it is joined by the palmar fascia. Over it lie the 

 palmaris longus tendon and the ulnar vessels and nerve. 



Dissection. Dissection. Follow the tendon of the flexor carpi radialis to its 

 insertion into the metacarpal bones, by dividing the overlying part 

 of the anterior ligament. 



insertion of The tendon of the flexor carpi radialis, in passing through the 

 nan ^ to ^ insertion lies in a groove in the trapezium between the 



