18 DISEASES OF THE HORSE’S FOOT 
Action.—The action of this muscle is to extend the third 
phalanx on the second, the second on the first, and the first 
on the metacarpus. It also assists in the extension of the 
foot on the forearm. 
Fic. 10.—TsHe FLexor TENDONS AND EXTENSOR PzEpIs. 
(AFTER HatBner.) 
1, Tendon of flexor perforans ; 2, its supporting check-band from the posterior 
ligament of the carpus ; 3, tendon of the flexor perforatus; 4, ring and 
sheath of the flexor perforatus ; 5, widening out of the flexor perforatus 
to form the plantar aponeurosis ; 6, suspensory ligament ; 7, reinforcing 
pa from the suspensory ligament to the extensor pedis ; 8, the extensor 
pedis. 
Toe Fiexor Pepis PERFoRATUS, OR THE SUPERFICIAL 
Fiexor oF THE PHaLancEes.—In common with the perforans, 
this muscle arises from the inner condyloid ridge of the 
humerus. It is reinforced at the lower end of the radius 
