316 



FASCIAE AND MUSCLES OF THE HORSE 



of the second phalanx, and forms a terminal fan-like expansion. At the PuHeys 

 of the digit the tendon contains cartilage and is thickened. From the distal fourth 

 of the metacarpus to the distal end of the second phalanx it is inclosed m the dig- 

 ital synovial sheath described in connection with the superficial flexor. The bursa 

 podotrochlearis or navicular bursa is found between the tendon and the distal sesa- 

 moid or navicular bone. The terminal part of the tendon is bound down by the 

 distal digital annular ligament described with the fascia. _ 



Relations.— The belly of the muscle is related posteriorly to the superhcial 



Extensor tendon 



Proximal end of capsule of fetlock 

 joint 



Bursa — ] 

 Collateral ligament of fetlock joint 

 Fascia 



Branch of suspensory ligament 



Lateral volar ligament of pastern 

 joint 



Suspensory ligament of navicular 

 bone 

 Band from cartilage to extensor il ' 

 tendon 

 Collateral ligament of coffin joint 



Superficial flexor tendon 



Deep flexor tendon 

 Suspensory ligament 

 Lateral interossev^ tendon 



Proximal end of digital sheath 

 Ring of superficial flexor tendon 

 Intersesamoidean ligament 

 Posterior annular ligament {cut) 



Collateral sesamoidean ligament 

 Superficial distal sesamoidean 



ligament 

 Middle distal sesamoidean ligament 



Attachments of proximal digital 

 annular ligament 



Pouch of digital sheath 



Distal digital annular ligament 

 Cartilage 



Fig. 286. — Ligaments and Tendons of Distal Part of Limb of Horse. 



Mc. Ill, Large metacarpal bone; Ph. I, first phalanx; Ph. II, second phalanx; Ph. Ill, third phalanx; 1, deep flexor 



tendon; 2, band from first phalanx to digital cushion. (After Schmaltz, Atlas d. Anat. d. Pferdes.) 



flexor and to the middle flexor of the carpus; medially, to the flexor carpi radialis, 

 the radial check hgament, and the median vessels and nerve; laterally, to the 

 ulnaris lateralis; anteriorly, to the radius and ulna and branches of the median 

 artery and nerve. Below the carpus the tendon is accompanied by the vessels and 

 nerves of the digit. It may also be noted that the muscle is not entirely covered 

 by the other flexors; it comes in contact with the skin and fascia on the postero- 

 lateral aspect of the proximal half of the forearm, and also on the lateral aspect of 

 the distal fourth. 



Blood-supply. — Median and ulnar arteries. 



