POSTERIOR FEMORO-CRURAL REGION 455 



perforatus of the fore-leg, to bo finally attached to the supero-posterior 

 part of the os coronso. Action — to extend the hock and flex the fetlock 

 and pastern joints. 



Plantaris is situated on the postero-external part of the thigh. 

 Origin — from the superior part of the head of the fibula. Insertion — to 

 the supero-external part of the os calcis. Action — to assist in extending 

 the hock. 



PoPLiTEUS lies at the back part of the stifle. Origin — fiom the lateral 

 part of the external condyle of the femur, from which it winds round the 

 head of the tibia. Insertion — to the supero-internal and posterior part of 

 the tibia. Action — to flerx the stifle joint. 



Flexor pedis perforans is situated on the jDostero-external side of the 

 leg. Origin — from the supero-external part of the tibia, from the body of 

 that bone and to the posterior jDart of the fibula. Insertion — to the 

 posterior part of the plantar surface of the os pedis. Action — to extend 

 the hock and to flex the fetlock and pasterns. 



Flexor pedis accessorius lies on the postero-internal part of the leg. 

 Origin — from the supero-external part of the tibia and side of the fibula. 

 Its insertion is blended with the tendon of the flexor pedis. 



