32 MUSCLES OF THE SHOULDER AND ARM. 



indeed it is not separate in the dog. The fibres pass 

 straight to the scapula, to be inserted along the verte- 

 bral edge. 



4. The Levator Anguli Scapulae arises from the 

 transverse processes of the posterior cervical verte- 

 brse. The fibres form a broad sheet of muscle, and are 

 inserted into the under or ventral side of the scapula 

 near the anterior angle of the vertebral margin. Its 

 insertion is just to the inside of that of the rhom- 

 boideus minor. 



5. The Levator Scapulae is a narrow flat band 

 of muscle which has its origin from the transverse 

 process of the atlas, and is inserted into the acromion 

 process of the scapula and a small extent of the neigh- 

 boring portion of the spine. Its insertion is just to the 

 inner side of that of the middle trapezius. This 

 muscle corresponds to the levator claviculcB of the cat. 



6. The Levator Humeri is a muscle similar in 

 shape to the last, lying nearer to the ventral mid-line. 

 It arises from the skull posterior to the external audi- 

 tory meatus, and is inserted below the middle of the 

 humerus, on its ventral face. Just before the muscle 

 passes over the shoulder-joint it is intersected by a 

 transverse line of tendon dividing it into two portions, 

 the anterior of which corresponds to the clavo-mastoid 

 of the cat, while the posterior division represents the 

 clavo-deltoid. 



7. The Sterno-mastoid lies to the inner side of 

 the last-mentioned muscle ; it will be described in 

 connection with the dissection of the neck. 



8. The Supra-spinatus is a large muscle occupy- 

 ing the whole of the supra-spinous fossa, from which 

 its fibres originate. They pass outward to be inserted 

 into the great tubercle of the humerus. 



