MUSCLES OF THE BODY. 119 
is wedged between the rhomboideus dorsally and the levator 
scapulz ventrally. 
Insertion either into the inner surface of the levator scapule 
-near its dorsocranial border at its insertion or into the scapula 
near the coracovertebral angle (Fig. 78, 7) or into both. Its 
fibres are very closely related to those of the rhomboideus. 
Relations.—By its outer surface with the clavotrapezius 
(Fig. 68, @) and acromiotrapezius (Z). At its insertion it is 
often overlaid by either the rhomboideus or the levator scapule 
or both. By its inner surface with the splenius (Fig. 73, 0). 
Its caudal third is'wedged between the rhomboideus and the 
levator scapule. 
Action.— Draws forward and rotates the scapula. 
M. rhomboideus (probably equivalent to the human rhom- 
boideus major and rhomboideus minor).—A rather thick trape- 
zoid muscle connecting the vertebral border of the scapula with 
the spinous processes of the adjacent vertebre. 
Origin from the caudal two or three fifths of the cervical 
supraspinous ligament and from the sides and tips of the first 
four thoracic vertebral spines and the interspinous ligaments 
caudad of these four spines. It passes lateroventrad, and the 
fibres converge somewhat so that the line of insertion is shorter 
than the line of origin. 
fusertion by a short tendon (1 millimeter long) into the 
vertebral border of the scapula, the line of insertion passing 
gradually from the inner (Fig. 78, ¢) to the outer (Fig. 76, 7) 
surface; and by fleshy fibres into the outer surface of the gleno- 
vertebral angle of the scapula (Fig. 76, z) in close connection 
with the origin of the teres major (7). A bundle of fibres at 
the cranial border may be inserted into the cranial border of 
the levator scapule at its insertion. 
Relations.—By its outer surface with the spinotrapezius 
(Fig. 68, 7), acromiotrapezius (4), latissimus dorsi (7), and 
clavotrapezius (@); it is usually partially separated from these 
muscles ‘by a mass of fat. By its inner surface near its insertion 
with the serratus anterior (Fig. 73, 2) and levator scapule 
(Fig. 73, %), and craniad with the splenius (Fig. 73, 4), and 
the tendon of the serratus posterior superior (Fig. 73, 7). At 
