vo THH HORSE. 
Pyrirormis.—Origin—from the transverse processes of the sacrum, and 
the internal face of the ilium by fleshy fibres, which are inserted into the 
trochanteric fossa. Action—to rotate the femur outwards. 
OBTURATOR EXTERNUS and INTERNUS are attached, one to the outside and 
the other to the inside of the margins of the obturator formmen, and to 
the two faces of the fascia which fills it up. Jnsertion—by separate 
tendons into the trochanteric fossa. 
Gemini arise by two bundles of fibres from the supero-posterior part 
of theischium. Jzsertion—to the trochanteric fossa, -Actton—the same as 
the three last-named muscles. 
ANTERIOR FEMORO-CRURAL REGION. 
Extensor Peps lies superficially on the anterior part of the leg. 
Origin—from a depression on the antero-inferior and external part of the 
external condyle of the femur. Jnsertion—to the coronal process of the 
os pedis. Action—to flex the hock and extend the foot. 
Peronevs lies on the antero-external side of the leg. Origin—from, 
the head of the fibula and outer part of the tibia. Jnsertion—to the 
supero-anterior part of the os suffraginis. Action—to assist the foregoing 
muscle. 
FLEXOR METATARSI is situated on the antero-internal side of the leg. 
Origin—in common with the extensor pedis, from the outer condyle of 
the femur, and from the upper part of the anterior face of the tibia. 
Insertion—to the os cuboides and to the large and small metatarsal bones. 
Action—to flex the hock. 
POSTERIOR FEMORO-CRURAL REGION. 
GASTROCNEMIUS EXTERNUS lies along the posterior part of the leg. 
Origin—in two portions from the fossa just behind and above each con- 
dyle of the femur. Znsertion—to a depression on the centre of the point 
of the os calcis. Actton—to elevate the point of the hock, and thus to 
extend the leg. 
GASTROCNEMIUS INTERNUS is situated on the postero-mesian part of the 
leg. Ovigin—from the inner part of the ridge which surrounds the fossa 
behind and between the two condyles of the femur. Jnsertion—above 
the hock it becomes tendinous, and passes over the point (from which it is 
separated by a large bursa mucosa, the seat of capped hock), and descends 
along the back of the flexor tendons, where it corresponds with the flexor 
perforatus of the fore leg, to be finally attached to the supero-posterior 
part of the os corone. 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. Znser tion—to 
the supero-external part of the os calcis. Action—to assist in extending 
the hock. 
Poruirevs lies at the back part of the stifle. Origin—from the lateral 
part of the external condyle of the femur, from which it winds round the 
head of the tibia. Znsertion—to the supero-internal and posterior part of 
the tibia. Action—to flex the stifle joint. 
FLEXOR PEDIS PERFORANS is situated on the postero-external side of 
the leg. Origin—from the supero-external part of the tibia, from the 
body of that bone and to the posterior part of the fibula. Jnsertcon—to 
