58 ANATOMY OF THE RABBIT 



25. Extensor digitorum lateralis m.: Lateral epicondyle of 

 humerus and proximal region of ulna; to fourth and fifth digits. 

 Extends and abducts these digits. Method: Be careful to 

 separate this from the next muscle (26) before transecting. It 

 is essentially the homologue of the extensor digiti quinti 

 proprius of man. 



26. Flexor carpi ulnaris minor m.: Olecronal process and 

 laterocaudal side of head of radius; to triquetral bone, or 

 possibly to proximoventral surface of fifth metacarpal. Flexes 

 and adducts carpus. Do not transect. 



27. Extensor carpi radialis longus m.: Medial supracon- 

 dyloid ridge of humerus; to proximal ends of second and third 

 metacarpals. Extends digits. Do not transect. The two 

 tendons of this muscle pass under the tendon of the next (28) 

 near the distal end of the radius. 



28. Extensor pollicis brevis m. : Laterocranial side of distal 

 half of radius; to first metacarpal. Adducts and extends the 

 poUex. Do not transect. 



29. Flexor carpi ulnaris m.: Superficial head, mediocaudal 

 side of olecronal process; and deep head, medial epicondyle of 

 humerus, fused with a head of flexor profundus m. (31) and the 

 sublimis m. (30) ; to pisiform bone. Flexes carpus. Transect 

 distad of the two heads. This is the most superficial of the 

 flexor group and is easily identified before the brachial fascia 

 has been removed by its inserting into the prominent pisiform 

 bone. 



30. Flexor sublimis digitorum m.: Medial epicondyle of 

 humerus, with deep head of Nos. 29 and 31;. to all the digits, 

 except, usually, the pollex. Flexes digits. Method: Probe the 

 mass of tendons between the pisiform bone and the first meta- 

 carpal free. The more superficial tendon is that of the subhmis; 

 the deeper and larger tendon is comprised of the tendons of the 

 various heads of the flexor profundus (31). The main insertion 

 of the tendons of this muscle is onto the metacarpophalangeal 

 joint where a large sheath is formed through which the tendon of 

 the profundus m. (31) passes. 



