THE 
VETERINARIAN. 
vol. iii. MARCH, 1830. No. 27. 
ANATOMY OF THE HORSE. 
[Continued from page 66.] 
4.—INFERIOR CERVICAL REGION. 
STERNO-M AXILLARIS. 
Situation. —Inferior part of the neck. 
Form .— Elongated ; cylindroid : flattened above and below. 
Attachment. —Posteriorly, to the cariniform cartilage of the 
sternum ; anteriorly, to the angle of the lower jaw. 
Relations. —Externally, with the cellular faschia of the neck, 
panniculus and levator humeri; internally, with the next muscle, 
trachea, and carotid artery; along its superior margin, with the 
jugular vein; along its inferior border (the posterior half) with 
its fellow; from which it gradually diverges to the head, leaving 
the trachea and next muscle exposed in the interspace formed by 
the divergence. Its tendon passes between the parotid and sub¬ 
maxillary glands. 
Direction. —Longitudinal: curving with the neck. 
Structure. —Tendinous and fleshy at the sternal end, and in¬ 
timately united with its fellow. About three-fourths of the ex¬ 
tent of the neck upwards, it terminates in a flat tendon. 
Action. —To inflex the head towards the breast. If one 
muscle act alone, it will, at the time of this inflection, incline the 
head to one side. The pair will also assist in opening the mouth. 
sterno-thyro-hyoideus \ Sterno-hyoideus. 
I Sterno-thyroiaeus. 
Situation. —Above the preceding muscle. 
Form. —Elongated, slender, cylindroid; flattened above and 
below ; trigastric; but unequal in its divisions. 
Attachment. —Posteriorly, to the cariniform cartilage of the 
sternum, above the preceding muscle: anteriorly, to the spur 
vol. hi. s 
i 
