370 THE MUSCLES OF THE DOG 
MUSCLES OF THE MANDIBLE 
The masseter is thick and its superficial face is strongly convex. It arises 
from the zygomatic arch, and extends beyond the branch of the jaw below and be- 
hind. Three partly separate strata may be recognized in its structure. 
The temporalis is very large and 
strong, and contains much tendinous 
tissue. It arises from the temporal 
fossa and the orbital ligament and 
ends on the coronoid process of the 
mandible. It blends in part with 
the masseter. 
The pterygoideus lateralis is 
not distinct from the medialis. 
The digastricus is absent. 
The occipito-mandibularis is a 
strong, round, fleshy muscle, which 
arises on the paramastoid process 
and is inserted into the border and 
medial surface of the ramus of the 
mandible at the level of the last 
molar teeth; it sometimes has a 
tendinous intersection. 
HYOID MUSCLES 
The mylo-hyoideus is well de- 
veloped. 
The stylo-hyoideus is very slen- 
der, and is inserted into the body of 
the hyoid bone. 
The hyoideus transversus and 
omo-hyoideus are absent. 
The sterno-thyro-hyoideus is 
large and arises chiefly on the first 
costal cartilage. It is clearly di- 
vided into sterno-thyroideus and 
sterno-hyoideus. 
Fic. 321.—Ventrat Muscies or Heap, NeEcK, AND THORAX 
or Dos. 
a, Mylo-hyoideus; 6, occipito-mandibularis; c, sterno- 
hyoideus; c’, sterno-thyroideus; d, sterno-cephalicus; e, brachio- 
MUSCLES OF THE THORACIC LIMB 
: es : poe xe? The trapezius is thin, and is 
long head of triceps; m, medial head of triceps; n, biceps Sate - = 
brachii; 0, brachialis; 7, 1’, 1’, mandibular lymph glands; 2, divided into cervl ral and thoracic 
thyroid gland; 3, external jugular vein. (Ellenberger-Baum, portions by a narrow aponeurotic 
Anat. d. Hundes.) ai oe 
part. Its line of origin extends from 
about the middle of the dorsal bor- 
der of the neck to the ninth or tenth thoracic spine, the right and left muscles 
meeting (except at their posterior part) on a median fibrous raphe. It is inserted 
into the entire length of the spine of the scapula. 
The omo-transversarius arises by a tendon on the lower part of the spine of 
the scapula (where it is often partially blended with thetrapezius), and is inserted 
into the wing of the atlas. 
cephalicus; f, subscapularis; g, superficial pectoral; h, deep peec- 
toral; i, rectus abdominis; k, obliquus abdominis externus; J, 
