316 FASCLE AND MUSCLES OF THE HORSE 
of the second phalanx, and forms a terminal fan-like expansion. At the pulleys 
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 in 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 superficial | 
Superficial flexor tendon 
Deep flexor tendon 
Extensor tendon Suspensory ligament 
Lateral interosseus tendon 
Proximal end of digital sheath 
Ring of superficial flexor tendon 
Intersesamoidean ligament 
Proximal end of capsule of fetlock 
joint 
Bursa Posterior annular ligament (cut) 
Collateral ligament of fetlock joint 
Collateral sesamoidean ligament 
Superficial distal sesamoidean 
2 ligament 
Middle distal sesamoidean ligament 
Fascia 
Branch of suspensory ligament \ 
Attachments of proximal digital 
J annular ligament 
Lateral volar ligament of pastern 
joint 
Pouch of digital sheath 
Distal digital annular ligament 
Cartilage 
Suspensory ligament of navicular 
bone 
Band from cartilage to extensor 
tendon 
Collateral ligament of coffin joint 
Fie. 286.—LIGAMENTS AND TENDONS oF DistaL Part or Limp oF Horse. 
Me. III, Large metacarpal bone; Ph. I, first phalanx; Ph. II, second phalanx; Ph. III. 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 ligament, 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. 
