44 PROCEEDINGS OF THE ACADEMY OF [1897. 



thick mass of minute fibres occupying the interval between the 

 humerus at the epicondyle and the olecranon. 



The Supinator long us is inserted on the dorsal aspect of the trape- 

 zium and not on the distal part of the radius, though it is held down 

 firmly to that bone. This result has been obtained after a careful 

 dissection. According to Burmeister the tendon runs along the 

 edge of the radius and turns toward the carpus — before reaching 

 this region, however, it is attached to the outer and lower end of the 

 radius, being somewhat broader as it does so. It passes under the 

 ligamentum carpi dorsalis. 



In his account of the Supinator brevis Burmeister does not men- 

 tion the ossicle in the tendon of origin, which was present in the 

 Academy's specimen. 



The Palmaris longus is in closer relation to the Flexor carpi 

 ulnaris than is the muscle first named to the Flexor sublimis digi- 

 torum. 



The Flexor sublimis digitorum and Flexor profundus digitorum are 

 distinct with the exception of a delicate tendon which unites the 

 muscles as they cross the wrist. 



The Flexor profundus digitorum consists of two divisions ; one for 

 the first and second digits is the main mass and arises from the 

 radius, the other passes to the remaining digits. Each division is 

 made up of two heads. The above account is distinct from the one 

 elaborately stated by Burmeister, who gives three heads for the 

 muscle, the first as in this essay, the second two heads and an ulnar 

 spindle-shaped fascicle. It is at the junction of the last named part 

 with the others at the wrist that the conjugate tendon is fixed. 



The Flexor longus pollicis arises by two heads, one from the epi- 

 trochlea and the other, a long one, from the proximal one-half of 

 the shaft of the radius. It sends a delicate slip to the Flexor pro- 

 fundus digitorum at the wrist and another to the Flexor sublimis 

 digitorum at the metacarpophalangeal joints. 



The Extensor carpi radialis brevior arises in common with the 

 Extensor communis digitorum and quite distinct from the Extensor 

 carpi radialis longior, and, therefore, trends from the epicondyle it- 

 self. 



The Extensor carpi radialis longior is in common origin with the 

 Supinator longus and, therefore, trends from the bold crest over the 

 epicondyle. The carpal extensors are not related to each other, but 

 to the adjacent muscles which lie in separate physiological group- 

 ing. 



