MUSCLES OF THE BODY. 119 



is wedged between the rhomboideus dorsally and the levator 

 scapulae ventrally. 



Insertion either into the inner surface of the levator scapulae 

 near its dorsocranial border at its insertion or into the scapula 

 near the coracovertebral angle (Fig. 78, f) or into both. Its 

 fibres are very closely related to those of the rhomboideus. 



Relations. By its outer surface with the clavotrapezius 

 (Fig. 68, d) and acromiotrapezius (//). At its insertion it is 

 often overlaid by either the rhomboideus or the levator scapulae 

 or both. By its inner surface with the splenius (Fig. 73, ^). 

 Its caudal third is wedged between the rhomboideus and the 

 levator scapulae. 



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 vertebrae. 



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. 



Insertion by a short tendon (i millimeter long) into the 

 vertebral border of the scapula, the line of insertion passing 

 gradually from the inner (Fig. 78, e] to the outer (Fig. 76, z) 

 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 (_/). A bundle of fibres at 

 the cranial border may be inserted into the cranial border of 

 the levator scapulae at its insertion. 



Relations. By its outer surface with the spinotrapezius 

 (Fig. 68, /), acromiotrapezius (//), latissimus dorsi (;#), and 

 clavotrapezius (d] ; 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, z) and levator scapulae 

 (Fig- 73> ^) an d craniad with the splenius (Fig. 73, b], and 

 the tendon of the serratus posterior superior (Fig. 73, /). At 



