270 



FASCIA AND MUSCLES OF THE HORSE 



l)ehind the lateral ligaments; (2) the distal extremity of the first phalanx, also 

 behind the lateral ligaments. 



Action. — To flex the digit and carpus, and to extend the elbow. 



Fig. 195. — Synovial Sheaths and Burs^ of Lower 

 Part of Right Fore Limb of Horse, Lnter- 

 NAL View. 



The synovial sheaths (colored yellow) and t 

 a. Sheath of extensor carpi obliquus; b, sheath 

 of flexor carpi internus; c, carpal sheath; d, d' , d" , d'" , 

 digital sheath; e, bursa under anterior extensor ten- 

 don; /, cajjsule of fetlock joint; 1, extensor carpi 

 radiali.s; 2, tendon of extensor carpi obliquus; 3, 

 flexor carpi internus; 4, flexor carpi medius; 5, superfi- 

 cial flexor tendon; S, deep flexor tendon; 7, suspensory 

 ligament; <S, small metacarpal bone; 9, large meta- 

 carpal bone; 10. posterior annular ligament of fetlock; 

 7/, proximal digital annular ligament; 12, radius; 13, 

 radiocari)al joint; 14, fetlock joint; 15, lateral cartilage; 

 16, band from first phalanx to lateral cartilage. (After 

 EUenberger, in Leisering's Atlas.) 



Fig. 196. — Synovial Sheaths and Burs.13 of Lower 

 Part of Right Fore Limb of Horse, Exter- 

 nal View. 

 he joint capsules (colored pink) are injected. 



a. Sheath of extensor carpi radialis; b, sheath 

 of anterior extensor; c, sheath of lateral extensor; d, 

 sheath of outer tendon of flexor carpi externus; e, e', 

 carpal sheath; /,/',/", digital sheath; 3, bursa under 

 anterior extensor tendon; h, bursa under lateral ex- 

 tensor tendon; ;', capsule of fetlock joint; 1, extensor 

 carpi radialis; 2, anterior digital extensor; 3, lateral 

 digital extensor; 4, flexor carpi externus; 4', 4". 

 tendons of 4>' 5, superficial flexor tendon; 6, deep 

 flexor tendon; 7, suspensory ligament; 8, external 

 metacarpal bone; 0, large metacarpal bone; 10, 

 posterior annular ligament of fetlock; i^, digital annular 

 ligament; 13. fetlock joint; 13, lateral cartilage; 14, 

 band from first ijhalanx to lateral cartilage. (.\fter 

 EUenberger, in Leisering's .\tlas.) 



Structure. — The fleshy portion of the muscle or humeral head takes origin 

 from the humerus. The radial head (Caput tendineuin) consists of a strong fibrous 

 band, usually termed the radial or superior check Ugament, which fuses with the 



