

THE THORACIC NERVES 



947 



^ 



brachial nerve (Fig. 816). It pierces the Intercostalis externus and the Serratus 

 anterior, crosses the axilla to the medial side of the arm, and joins with a filament 

 from the medial brachial cutaneous nerve. It then pierces the fascia, and supplies 

 the skin of the upper half of the medial and posterior part of the arm, communicat- 



INTER NAL 



INTERCOSTO- 

 BRACHIAL 



LATERAL CUTANEOUS 

 BRANCHES OF III 

 TO XI THORACIC 



LATERAL CUT 



NEOUS OF XI 



THORACIC 



ILIOHYPOGASTRIC- 



FIG. 821. Intercostal nerves, the superficial muscles having been removed. (Testut). 



ing with the posterior brachial cutaneous branch of the radial nerve. The size 

 of the intercostobrachial nerve is in inverse proportion to that of the medial brachial 

 cutaneous nerve. A second intercostobrachial nerve is frequently given off from 

 the lateral cutaneous branch of the third intercostal; it supplies filaments to the 

 axilla and medial side of the arm. 



