ANATOMY OF THE HORSE. 
545 
Relations. —Anteriorly, with the preceding muscle and the 
extensor obliquus; posteriorly, with the flexores, perforans et 
perforatus; internally, with the ulna and radius; externally,with 
the faschia and skin. 
Direction .—Half-penniform: from above downwards, and 
from behind forwards. 
Structure .—It may be denominated a muscular slip • whose 
superior attachments are tendinous and fleshy; anterior part apo¬ 
neurotic ; and posterior partly tendinous, but mostly fleshy. 
A little higher than the knee, it detaches a slender flattened ten¬ 
don, which passes through a sheath, under the external lateral 
ligament, and then inclines forwards, and unites about half-way 
down the leg with the long extensor ligament. 
Action .—To assist in extending the fetlock, and also,in some 
degree, the knee ; and to tighten the extensor ligament. 
EXTENSOR METACARPI OBLIQUUS VEL PARVUS. — Radialis - 
metacarpeus obliquus . 
Situation .—Deep-seated: infero-anterior parts of the arm. 
Figure. —Triangular; flattened ; somewhat curved. 
Attachment .—Superiorly, to the outer and infero-anterior parts 
of the body of the radius: inferiorly, to the supero-anterior part 
of the os metacarpi internum. 
Relations. —Anteriorly, with the extensor pedis, faschia and 
skin; posteriorly, with the radius, extensor metacarpi, and knee 
joint: to the outer side, with the preceding muscle; to the inner, 
with the extensor metacarpi. 
Direction. —Oblique and inclined to a curve, from above 
downwards, and from behind forwards. 
Structure. —It consists of a small fleshy slip beginning’ in a 
pyramidal point, but growing broader as it descends, and ending 
in a tendon, which crosses under the extensor pedis, but over 
the extensor metacarpi. Its superior attachments are principally 
fleshy; its belly is palish, and aponeurotic upon its front surface. 
Its tendon is slender and flattened, arising about midway down 
the arm, crosses just above the knee within a sheath to the inner 
side, and at its termination expands and becomes confounded 
with the general fibrous covering of the knee joint. 
Action .—To maintain the tendon of the extensor metaearpi in 
its place durum action: it will also have some elfect in extending: 
the leg. 
[To be continued.] 
