118 THE MUSCLES. 
Near its origin its caudal border touches the outer surface of the 
spinotrapezius (7). Its cranial border is overlaid near its 
insertion by the levator scapule ventralis (/) and is closely 
related to the caudal border of the clavotrapezius (@) near its 
origin. 
Action.—The two muscles hold the scapulz together. 
M. clavotrapezius (Fig. 68, d@).—The clavotrapezius 
(cranial part of the human trapezius) is a flat muscle passing 
from the lambdoidal crest and middorsal line to the clavicle 
and covering the side of the neck. 
Origin.—The medial half of the lambdoidal crest and the 
middorsal line between the crest and the caudal end of the 
spine of the axis. The fibres are parallel and pass caudoven- 
trad so that the muscle covers the ventral surface of the neck 
caudally and fills the concavity at the front of the shoulder. 
Insertion into the clavicle and into a raphe between the 
clavotrapezius and the clavobrachial'(¢) muscles. This raphe 
extends along the clavicle and for some distance laterad of it. 
The muscle is partly continuous with the clavobrachial (e). 
Relations. —Outer surface with the platysma, and at its 
craniomedial angle with the levator auris longus. Inner sur- 
face with the rhomboideus, splenius, occipitoscapularis, levator 
scapulz, cleidomastoid, and supraspinatus. The cranial edge 
touches the sternomastoid. The caudal border touches the 
acromiotrapezius near the origin. 
Actton.—Draws the scapula craniodorsad. 
This muscle and the clavobrachial (¢) are sometimes con- 
sidered as forming a single muscle, the cephalohumeral, or 
cephalobrachial. 
M. occipitoscapularis (or levator scapule dorsalis or 
rhomboideus capitis) (Fig. 73, @).—The occipitoscapularis 
(equivalent to a part of the human rhomboideus) is a slender 
flat muscle from the lambdoidal ridge to the coracovertebral 
angle of the scapula. 
Origin, the medial half of the lambdoidal ridge beneath the 
clavotrapezius (Fig. 68,-@). The origin does not extend quite 
to the middle line. The muscle passes almost directly caudad. 
Its caudal end is thicker and narrower than the cranial end and 
