i 7 8 



APPLIED ANATOMY. 



aponeurosis of the external oblique muscle and sheath of the rectus muscle. It 

 inserts into the outer lip of the bicipital groove. It is to be noted in regard to this 

 muscle that it is attached only to the inner half of the clavicle and that the clavicular 



Acromial branch 

 Humeral branch 



Cephalic vein 

 Coracoid proo 



Clavi pectoral fascia 



Deltoid 



Costocoracoid 

 membrane 



Superior 

 thoracic vessels 

 and nerves 



Thoracic branch 

 Acromial thoracic artery 



major 



Pectoralis minor 



, 



FIG. 201. The clavi pectoral fascia. 



and sternal parts are separated by a cleft. When removing it in excision of the 

 breast for carcinoma one separates the muscle by passing through this cleft and 



detaching the part below. It forms the anterior 

 fold of the axilla and by following this fold to the 

 chest-wall it leads to the fifth rib, as it is at that 

 / / fi rib that the muscle leaves the chest- wall. 



The pectoralis major is covered by the pec- 



^ toral fascia. When in removal of the 



^T r~W^SlHl "\ female breast for nonma- 



^^ . W III lignant growths the breast 



is raised, the muscle be- 

 neath is seen to be covered 



'('/ J^,-. with a thin fascia continu- 



ous with the fascia of the 

 axilla. Beneath the pec- 

 toralis major is the dam- 

 pectoral fascia continuous 

 with the costocoracoid 

 membrane above and the 

 axillary fascia at the sides. 

 The pectoralis 

 minor passes from the 

 third, fourth, and fifth ribs 

 to the coracoid process. Its 

 origin is well forward to- 

 ward the anterior extremi- 

 ties of the ribs and, as it is 

 not attached so low on the 

 chest as is the pectoralis 

 major, it is hidden by the latter and does not aid in forming the anterior axillary fold. 

 This muscle is frequently removed in operations for carcinoma of the mammary gland. 



FIG. 202. The serratus anterior muscle arising by ten digitations from the 

 nine upper ribs. 



