ANATOMY OF THE HORSE. Go 
internally, with the dorsum llei and gluteus interims ; anteriorly, 
with the tensor vaginae; posteriorly, with the lumbar and sacral 
spines and biceps adductor. 
Structure .—This is a pulley muscle, coarse and dark-coloured 
in its texture; wholly fleshy, excepting some broad tendinous 
intersections, which, at the trochanter, become formed into a 
broad flat tendon, which is surrounded by fleshy fibres. 
Action. —The same as that of the next muscle. 
gluteus internus. — llio-tro chanter ins Parvus. 
Situation.— Deeply placed, underneath the preceding muscle. 
Figure. —Fan-shaped; its fibres describing two contrary 
curves. 
Attachment. —Superiorly, to the dorsum ilei, as high up as 
where the gluteus maximus ceases to be attached, and as far 
back as the border to which the sacro-sciatic ligament is fixed; 
inferiorly, to the (anterior protuberance upon the) trochanter 
major. 
Relations. —Externally, with the gluteus maximus ; internally, 
with the ilio-femoral articulation. 
Structure. —Principally fleshy: inferior portion intersected at 
regular distances by layers of tendon, which at the trochanter 
become united together into one broad flat tendon, curiously 
grooved (in radii) upon its external surface. 
Action of the Glutei. —These muscles are extensors either of 
the os femoris upon the pelvis, or of the pelvis and loins upon 
the hind quarter. Wi en the limb has been carried in advance 
under the body by the muscles of the anterior femoral region, 
and the toe firmly set down upon the ground, the glutei, by 
extending the haunch, will carry’ the trunk forward ; thus be¬ 
coming potent agents in progression; and of them the maximus 
is by far the most pow erful. In the acts both of rearing and 
kicking these muscles are thrown into violent and forcible 
action: in the former act, the limbs become the fixed points; in 
the latter, the trunk. 
2.—PELYI-TROCHANTERIAN REGION. 
These muscles are but small, and are all attached to the 
trochanter major. 
pyriformis. —Sacr o-tro chant erius. 
Situation .—Supero-lateral parts of the pelvic cavity. 
Figure —Conical: base turned forwards. 
