34 



THE UPPER EXTREMITY 



M. Serratus Anterior (O.T. Serratus Magnus). The 



serratus anterior arises by fleshy digitations from the upper 

 eight ribs, about midway between their angles and cartilages. 



Mm. Cqraco- 

 brachialis and 

 Biceps brachii 

 (cap. brev.) M. Pectoralis minor 



M. Omohyoideus 



M. Triceps 

 (cap. long.) 



FIG. 15. Costal aspect of the Scapula with the Attachments 

 of Muscles mapped out. 



The slips are arranged on the chest wall so as to present a 

 gentle curve convex forwards. The lower three interdigitate 

 with the external oblique muscle of the abdomen. The 

 serratus anterior is inserted into the entire length of the 

 anterior lip of the vertebral border of the scapula, and it falls 



