662 
ANATOMY OF THE HORSE. 
Structure .—Superior attachment, tendinous; surfaces par¬ 
tially aponeurotic. Its belly hAs a single broad tendinous inter¬ 
section, which terminates below in a thick flattened tendon, having 
its under surface thinly covered with fleshy fibres. The part 
attached to the olecranon is but a narrow thin fleshy slip. 
Action .—To bend the leg. 
epicondylo-metacarpeus .—Flexor metacarpi internus . 
Situation .—Postero-internal side of the arm. 
Form . —Longer, but not so broad as the preceding muscle. 
Attachment . — Superiorly, to the internal condyle of the hu¬ 
merus; adhering to the capsular ligament of the elbow joint. 
Inferiorly, to the head of the internal metacarpal bone. 
Relations .—Posteriorly and internally, with the faschiaand 
skin ; internally, with the last muscle; anteriorly, with the radius, 
and humeral blood-vessels and nerves. 
Structure .—Superior attachment, tendious ; in part, fleshy. 
Surfaces aponeurotic. Just above the knee it sends off a narrow 
flattened tendon, which passes through a tendinous theca. 
Action .—To bend the leg. 
ulnaris accessorius .—Flexor accessorius sublimis. 
Situation .—Posterior part of the arm. 
Form .—Elongated ; thick; fusiform. 
Attachment. — Superiorly, to the postero-internal part of the 
ulna, below the olecranon: inferiorly, to the tendon of the flexor 
perforans. 
Direction .—Oblique : from above downwards ; and from 
without inwards. 
Structure .—Superior attachment tendinous in part, but mostly 
fleshy. Inferior surface, aponeurotic. A little above the middle 
of the arm it sends off a tendon w hich passes under the posterior 
annular ligament of the knee, and there unites itself to the 
tendon of the perforans. 
DEEP POSTERIOR BRACHIO-CRURAL REGION. 
The following muscles constitute the deep-seated flexors: 
they lie anteriorly to and are concealed by the superficial. 
flexor fedis perforatus.— Epicondylo-phalangeus. 
Situation. —Deep-seated in the posterior part of the arm. 
Form .—This and the flexor perforans form one thick, com¬ 
pact, cylindroid fleshy mass; the tendons issuing from which are 
long and flattened, and adapted by convexity and concavity of 
surface to each other. 
