758 Till' A A'/,' TAX 



6. Great Dorsal Branch. (Fig. 347, G.) 



Formed of fibres, the larger portion of which come from the eighth 

 cervical pair, this braiich proceeds backwards and upwards to the internal 

 face of the latissimus dorsi, and is soon expended in that muscle. It is long 



and thick. 







7. Axillary or Circumflex Nerve. (Fig. 347, 13.) 



Somewhat considerable in volume, this nerve is furnished directly by the 

 eighth cervical pair. It passes backward and downward on the internal 

 face of the subscapularis muscle, to the interstice between it and the adductor 

 of the arm, where it crosses the subscapulur artery. It proceeds behind 

 the scapulo-huineral articulation, along with the circumflex artery, enters 

 between the short abductor of the arm and the caput magnum and medium, 

 and arriving beneath the abductor brachii, it divides into several diverging 

 branches, destined to the two abductors, the levator humeri, and even to the 

 integuments covering the anterior region of the arm. 



Before entering the space that lodges the subscapular artery, it sends 

 filaments to the teres internus. 



8. Nerve of the Adductor of the Armor Teres Major. (Fig. 347, 12.) 



This arises from the eighth cervical pair, like the preceding, by the 

 same trunk, and passes backward, at first on the subscapularis muscle, 

 then the adductor, in the substance of which it disappears by numerous 

 filaments. 



9. Subscapular Branches. (Fig. 347, 14.) 



These branches are two in number, and are generally derived from the 

 trunk of the seventh pair. After a short course backwards, they divide 

 into several ramuscules which pass among the fibres of the subscapularis 

 muscle. 



10. Superscapular Nerve. (Fig. 347, 15). 



Very short and thick, this nerve is formed by the sixth and seventh 

 cervical pairs. After a brief course backwards, between the angularis on 

 the one side, and the pectoralis prescapularis and superspinatus on the 

 other, it gains the space between the latter muscle and the subscapularis, 

 and enters it a little above the super- or prescapular artery. It is then 

 carried to the external face of the scapula, after bending round the anterior 

 border of that bone, passes across the acromion spine, and ascends to the 

 subspinous fossa, to expend itself in the muscle occupying this space. On its 

 passage beneath the superspinatus, it gives off several ramuscules to that 

 muscle. 



11. Anterior Brachial or Musculo-cutaneous Nerve. (Fig. 347, 17.) 



This nerve proceeds from the seventh and eighth cervical pairs, descends 

 to the internal face of the scapulo-humeral articulation, and meets the 

 axillary artery, which it crosses outwardly, at an acute angle. It then 

 joins the median nerve by a large short branch, that passes beneath the 

 artery and forms a loop around it ; descending in front of the median 

 nerve, to the bifurcation of the coraco-humeralis, it insinuates itself between 

 the two branches of that muscle, and breaking up into several ascending 



