84 
ANATOMY OF THE HORSE* 
OS CALCIS. 
Situation —It forms the posterior projecting part called the 
point of the hock* 
Figure —Irregular* Division —Into body and tuberosity* 
The body is the broad or inferior part* It is irregularly con¬ 
vex externally, where it is joined with the tuberosity! concave and 
expanded internally, where it presents four surfaces for articula¬ 
tion with the astragalus, with asperous interspaces for ligament. 
The inferior part of the body has a narrow articulatory surface, by 
which it articulates also with the cuboid bone* 
The tuberosity, the projecting part behind, is oblong, flat¬ 
tened on its sides, and exhibits a thick tuberous termination, into 
which is implanted the tendons of the gastrocnemii. The exter¬ 
nal side is flattened and roughened by ligamentous connexion; 
the internal is smooth, and inclines to concavity, by which a space 
is left which gives passage to the tendon of the flexor pedis. 
CUBOID BONE. (os CUBOIDES.) 
Situation— Outer part of the hock. Form— Oblong, from back 
to front. Division —Into external, internal, superior, and inferior 
surfaces. 
The external surface , broad and irregularly curved, is roughen¬ 
ed by ligamentous adherence. — The internal surface , irregularly 
excavated and asperous, exhibits three places of articulation: one, 
posteriorly, for the great cuneiform; the other two smaller, one 
anteriorly, one posteriorly, for the middle cuneiform bone. The 
superior surface has two articulations, with a little pit between 
them ; one for the astragalus, a larger one for the os calcis.— The 
inferior surface presents two articulatory places : one for the ex¬ 
ternal splint bone, the other for the cannon bone* 
THE LARGE CUNEIFORM BONE. (OS CUNElFORME MAGNUM.) 
Situation —Immediately underneath the astragalus* 
Figure —Triangular : broadest side turned forwards ; salient 
angle, backwards* Flat above and below. 
Division —Into superior and inferior surfaces, sides, and angles. 
— The superior surface is entirely articulatory, with the exception 
of a little rough groove running to its middle from the outer side, 
which terminates in the medullary hole: it is adapted to the 
under part of the astragalus.— The inferior surface is very similar 
in appearance to the superior, except that it is flat, or rather in¬ 
clines to convexity : it articulates with the middle cuneiform, and 
also, next the internal angle, with the small cuneiform.— The sa - 
