PECTORAL REGION 7 



cover of the serratus anterior muscle. At a later stage 

 these branches will be found appearing between the digita- 

 tions of the serratus anterior. The anterior branches come 

 out, as a rule, about an inch in front of the corresponding 

 posterior branches, and then proceed forwards over the lower 

 border of the pectoralis major muscle, where they should be 

 sought for at once. From the lower members of this series 

 some minute twigs are given off, which enter the superficial 



M. teres major 

 M. latissimus dorsi 



M. pectoralis major 



Lobules of the gland 



Ampullae of ducts 

 I M. serratus ant 



Fibrous trabeculae of the gland "" 



FIG. 2. Dissection of the Mamma. 



surface of the digitations of the external oblique muscle 

 of the abdomen. The posterior branches run backwards, 

 to the dorsal aspect of the trunk, over the anterior border 

 of the latissimus dorsi muscle. 



It is advisable not to attempt to secure the two highest lateral cutaneous 

 nerves (i.e. those issuing from the second and third intercostal spaces) in 

 the meantime. They are best dissected along with the other contents of 

 the axilla. 



Dissection. If the subject be a female the dissector should endeavour 

 to make out the connections, and also something of the structure, of the 

 mamma. The small area of skin which has been left over the areola 

 should be raised towards the summit of the nipple, and bristles may 

 be introduced through the orifices of the ducts which may be seen on the 

 116 



