14 STUDIES IN COMPAKATIVE ANATOMY. 



the front of the end of the ulna, the posteiior into the outer sur- 

 face of the end of the same bone. The tendon of extensor minimi 

 digiti separates the two portions. The insertion consists of white 

 fibres chiefly. 



Falmaris longus arises from the back of the internal condyle 

 of the humerus, and from the strong intermuscular septa which 

 divide it on the radial side from fiexor communis digitorum, and 

 on the ulnar side from fiexor carpi ulnaris. Palmaris is a flat 

 muscle, becoming tendinous at the commencement of the carpus, 

 where it spreads out over the palm. The strongest portion of 

 the tendon passes to the ulnar side, and is inserted into the 

 sesamoid bone of the 5th digit. A median portion is much 

 slighter, and is lost in the palm. On the radial side, part of the 

 expansion blends with that of the extensor tendon. Lastly, a 

 strong tendinous bundle of palmaris is attached by its deep 

 surface to the annular ligament, nearly over the tendon oi fiexor 

 carpi radialis, and superficial to the origin of fiexor hrevis. 



C. and L.— 283, figs. 1, 2 (a) ; 284, fig. 2 (a). 



Flexor carpi ulnaris arises by two heads, one, thin and pointed, 

 from the internal condyle, the common aponeurosis, and exten- 

 sively from the intermuscular septum between this muscle and 

 fiexor communis digitorum. The second head, on the ulnar side, 

 arises thick and fleshy from the back and inner side of the ole- 

 cranon, immediately below the insertion of triceps. The ulnar 

 nerve passes between the two heads of origin. The united 

 muscle is inserted into the pisiform bone, and continued thence 

 by strong fibres to the ulnar side of the manus. 



C. and L.— 274-5 O) ; 276-7 (/3) ; 283, figs. 1, 2 (/3) ; 284, 

 figs. 2, 4 (^). 



Flexor communis digitorum, arises by a common tendon with 

 palmaris and fiexor carpi ulnaris from the back of the internal 

 condyle of the humerus. Its deep surface is tendinous, and 

 separated by loose cellular tissue from the bones of the fore-arm. 

 It ends in a very strong, flat tendon, which divides into five 

 opposite the base of the radial sesamoid bone. Of these tendons, 

 those to the 1st and 5th digits are only half the size of any of 

 the others. The middle tendon is rather the strongest of the 

 remaining three. Inserted as usual into the terminal phalanges. 

 A small muscle, which may correspond to fiexor longus pollicis, 



