142 PROCEEDINGS OF THE ANATOMICAL AND ANTHROPOLOGICAL 



inside the insertion of the pronator radii teres, and which gave fibres 

 also to the flexor sublimis digitoruin. 

 Otherwise as in man. 



Palmaris lomjas. 



Has been already referred to. 



The condition of the flexor muscles of the fingers is of the highest 

 importance from the morphological point of view. 



Flexor sublimis diyitorum. 



The flexor sublimis digitorum supplies tendons to the index, 

 middle, ring and little fingers. The tendon for the index has a 

 distinct belly separable up to its origin from the coronoid process 

 of the ulna, and accordingly the tendon has to pass under the 

 tendons to the third, fourth and fifth fingers to get to the index. 



The tendon for the middle finger had also a distinct belly trace- 

 able to the ulna, but it received also a large flattened reinforcement 

 of muscular fibres from the septum behind pronator radii teres, and 

 which also gave fibres to the flexor carpi radialis. The belly proper 

 (ulnar) had already become tendinous when it received this radial 

 reinforcement, and this latter was inserted into the side of the tendon. 



The tendons for the fourth and fifth fingers joined to form one 

 common tendon at the level of the carpus. 



Flexor longus pollicis. 



The flexor longus pollicis, though corresponding in position to 

 the muscle of the same name in man, is really a misnomer in the case 

 of the chimpanzee. It supplied the index only and gave no offshoot 

 to the thumb. Champneys found a tendon to the thumb in his case 

 but Vrolik did not. It is said to be represented often by a fibrous 

 band, and in my case there was a distinct tendinous band traceable 

 from the middle of the thumb metacarpal to the base of the last 

 phalanx. The main use of the hand as a grasping organ, combined 

 with the small size of the thumb, will explain this peculiar disposition 

 of the flexor longus pollicis in the chimpanzee. 



