_a_, Trapezius; _b_, omo-transversarius; _c_, _c′_, mastoido-humeralis
(_c_, cleido-mastoideus; _c′_, cleido-occipitalis); _d_,
sterno-cephalicus; _e_, deltoid; _f_, long head, _f′_, external head
of triceps; _g_, superficial pectoral; _h_, posterior deep pectoral;
_i_, serratus magnus; _k_, latissimus dorsi; _l_, obliquus abdominis
externus; _l′_, aponeurosis of _l_; _m_, serratus posterior; _m′_,
lumbo-dorsal fascia; _n_, obliquus abdominis internus; _o_, tensor
fasciæ latæ; _o′_, fascia lata; _p_, gluteus medius; _q_, _q′_,
biceps femoris; _r_, semitendinosus; _s_, sacro-coccygeus superior;
_t_, sacro-coccygeus lateralis; _u_, coccygeus. (After
Ellenberger-Baum, Anat. f Künstler.)
]
There are two scaleni. The =scalenus ventralis= (s. primæ costæ) arises
on the first rib and ends on the transverse processes of the third to
the seventh cervical vertebræ. It is traversed by the roots of the
brachial plexus, which partially divide it into a small dorsal and a
large ventral part. The brachial vessels lie below the latter. The
=scalenus dorsalis= (s. supracostalis) arises usually on the second,
third, and fourth ribs, and ends on the transverse processes of the
third to the sixth cervical vertebræ.
The =rectus capitis anterior major= arises on the third to the sixth
cervical transverse processes, and blends at its insertion with the
sterno-mastoideus and the mastoid portion of the mastoido-humeralis.
The =rectus capitis anterior minor= is larger than in the horse.
The =rectus capitis lateralis= and =longus colli= resemble those of the
horse.
The =intertransversales= are large. From the sixth cervical vertebra
forward they form a muscular mass (M. intertransversarius longus) which
is inserted into the wing of the atlas.