N 
THE 
i 
VETERINARIAN. 
# / 
vol. in. MAY, 1830. No. 29. 
ANATOMY OF THE HORSE. 
(Continued from page 189.] 
4.—STERNAL REGION. 
COMPRISING some small muscular slips in the vicinity of 
and attached to the sternum. 
lateralis sterni. — C osto-sternalis. 
Structure. —Upon the antero-inferior part of the outer surface 
of the thorax, bordering upon the sternum. 
Figure. —Long, flat, thin : trapezoid. 
Attachment. —Anteriorly, to the postero-inferiorhalfof the first 
rib : posteriorly, to the superior three-fourths of the cartilage of the 
third rib ; whence its aponeurosis is extended to the cartilages of 
the fourth and fifth, and also to the sternum. 
Relations. —Externally and inferiorly, with the pectoral muscles; 
superiorly, with the serratus; internally, with the second rib and 
intercostal muscles. 
Direction. —Oblique ; from above downwards and from before 
backwards. 
Situation. —Its anterior attachment is by means of a short flat 
tendon ; its posterior is entirely aponeurotic. Both its surfaces 
are partially interspersed with tendinous expansions. 
Action. —To operate in the contraction of the chest by approxi¬ 
mating the cartilages of the anterior ribs, and elevating, in some 
measure, the sternum. 
sterno-costales.— (Extend et Interni.) 
Several fleshy digitations, interspersed with slips of tendon, 
running from the cartilages of all the true ribs, excepting the first, 
to the sternum. Their fibres are taking the same course, and are 
continuous (in the intervals between the cartilages) with the in¬ 
tercostales. 
k k 
VOL. III. 
