23i 



THE MUSCLES. 



the medium of the subbrachial aponeurosis of the panniculus and a con- 

 siderable quantity of cellular tissue. Its upper border adheres in an intimate 

 manner to the last-named muscle, and is bordered by the spur (external 

 thoracic) vein. The large vascular trunks which leave the chest to reach 



the anterior limb, pass above its anterior extremity, by crossing its 

 direction. 



Action. It pulls the whole limb backwards, in pressing on the angle of 

 the shoulder. 



B. STERNO-PRESCAPULARTS. (The pectoralis parvus of Percivall and 

 Bourgelat.) Form Situation Direction. A long prismatic muscle, con- 



