346 THE HORSE. 
over it into two shallow cavities (the superficies of the internal being 
the larger), which correspond with the trochlear prominences, situated 
anteriorly to the condyles of the femur. Superiorly it presents a trian- 
cular roughened space, bounded by its two lateral angles, which gives 
attachment to muscles, and inferiorly we notice a fourth angle. Thees 
angles are all blunt and slightly rounded off. 
BONES OF THE LEG. 
THE TIBIA (so called because the ancient shepherds used this bone 
as a flute) lies between the femur and tarsus (hock), forming an angle 
with each. It is broad, and of a spongy texture above; contracted 
and dense below, where it is felt immediately beneath the skin and 
tendons, 
Fig. 35.—Tipia, Fiscta, anp Tansus, 
A. Tibia. 
1. 2. Articulatory surfaces. 
2. Tuberosity. 
4. Spine. 
5. External malleolus. 
. Astragalus. 
. Os seaphoides. 
. Os cuneiforme magnum. 
. Os cuboides. 
. Os cuneiforme parvuin. 
6. Surfaces articulating with astragalus. Upper part of large metatarsal bone. 
GB. Fibula. . Upper portion of the external small meta 
C. Os ealcis. tarsal bone. 
7. Point of hock. 
AS edad 
THE Bopy is of a triangular or prismatic shape above, its angles gra- 
dually rounding off below, and then expanding lateraly to meet the 
