SHORT MUSCLES OF THE THUMB. 



77 



flexor on the inner side, the student should begin near the head of 

 the metacarpal bone, where there is usually a slight interval. 



The OPPOXEXS POLLICIS (B) arises from the annular ligament Opponens 

 beneath the preceding, from the tubercle of the scaphoid beneath 



bone 



FIG. 31. DEEP DISSECTION OF THE PALM OF THE HAND 

 (ILLUSTRATIONS OF DISSECTIONS). 



Muscles : 



A. Abductor pollicis. 



B. Opponens pollicis. 



C. Flexor brevis pollicis. 



c'. Adductor obliquus pol- 

 licis. 



D. Adductor transversus 

 pollicis. 



E. Abductor minimi digiti. 



F. Flexor brevis minimi 

 digiti. 



G. Opponens minimi digiti. 

 i. Lumbricales. 



J. First dorsal interosseous. 



Vessels : 



a. Ulnar artery, cut. 



b. Its deep branch. 



c. Deep palmar arch. 



d. Radial digital artery of the 

 index linger. 



e. Arteria princeps pollicis. 

 /. Interosseous arteries. 



1. Ulnar nerve, cut. 



2. Its deep part, continued at 4 

 to some of the thumb muscles. 



3. Offsets to the inner two 

 lumbricales. 



the abductor, and from the outer side of the ridge of the trapezium ; 

 and it is inserted into the outer surface and radial border of the 

 metacarpal bone for the whole length. 



This muscle is for the most part concealed by the abductor, beneath 



J ' former; 



