THE URM'lllM. I'LEXl'X 



921 



subscapular artery along the axillary margin of the subscapularis mu.-cle, anil ends 

 in the latissimus dursi dig. (579). 



The lower subscapular nerve, carrying fibres from the fifth and sixth cervical 

 nerves, passes behind the subscapular artery, below the circumflex branch (dnrsalis 

 scapuhr), and is distributed tot lie teres major, and furnishes to the subscapularis one 

 or tuo twigs which enter that muscle near its axillary mar-tin. 



The terminal branches arc two from each cord. The posterior cord divides 

 into the axillary (circumflex) and the radial (museulo-spiral) nerves. The outer 

 cord divides into the miisculo-cutancous nerve, and the outer root of the median 

 nerve; the inner cord into the ulnar nerve, and the inner root of the median nerve. 



The Axillary (Circumflex) Nerve is the smaller of the two terminal hranche- of 

 the posterior cord, and contains fibres from t he fifth and sixth cervical nerves (figs. 675 



\i:. 680. DISTRIBUTION OF CUTANKOCS NKHVF.S ox Tin: AMKKIOR AND POSTERIOR ASPK* is 



OF THE Si cumin EXTREMITY. 



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 CUTANEOUS 

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 WR1SBEBO] 



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VLNA R 



and 678). At the lower border of the subscapularis it passes dorsal wards and accom- 

 panies the posterior circumflex artery through the quadrilateral space, which is 

 bounded by the teres major. Ion-; head of triceps, and .subscapularis muscles, and the 

 surgical neck of the humerus. and it divides into a smaller superior and a larger in- 

 ferior division. Previous to its division it furnishes an articular twig to the shoulder- 

 joint. This twi-r pierces the inferior part of the articular capsule. 



The superior division accompanies the posterior circumflex artery around tlio 

 neck of the humerus. and gives oft a number of stout twigs which enter the deltoid 

 muscle (fig. 679). A few line filaments pierce the deltoid and end in the integument 

 which covers the middle third of that muscle. 



The inferior division divides int;> cutaneous and muscular branches. The 

 cutaneous branch (the lateral brachial cutaneous nerve) turns around the posterior 

 border of the deltoid, pierces the deep fascia, and supplies the skin covering the lower 



