186 HANDBOOK OF ANATOMY 



border of the scapula, then through the suprascapular foramen 

 and winds round the great scapular notch. 



Infraelavieular Nerves. The anterior set from the inner and 

 outer cords supply the chest and front of the limbs, the posterior 

 set of nerves from the posterior cord supply the shoulder and 

 the back of the limb. 



Anterior Thoracic Nerves. The external anterior thoracic 

 nerve arises from the outer cord, and the internal one from the 

 inner cord. They pass down one on each side of the axillary 

 artery, and are finally distributed to pectoralis major and 

 minor. 



Museulo-Cutaneous nerve from the outer cord lies first 

 between coraco-brachialis and the axillary artery; it then lies 

 between biceps and brachialis to the bend of the elbow. It 

 becomes cutaneous between biceps and brachio-radialis, and 

 ends by supplying the skin on the outer side of the forearm. 



Branches. Muscular to biceps, brachialis anticus and coraco- 

 brachialis (this last nerve is not really a branch of musculo- 

 cutaneous, but is an independent branch from the sixth and 

 seventh cervical nerves incorporated with it). 



Cutaneous. Anterior branch supplies the outer half of the 

 anterior surface of the forearm as far as the ball of the thumb. 

 The posterior branch supplies the upper three-fourths of the 

 outer half of the posterior surface of the forearm. 



Median nerve arises by two roots one from the outer cord 

 and one from the inner. The outer head passes down on the 

 outer side of the axillary artery, and the inner head crosses over 

 at the beginning of the brachial artery to join it. The complete 

 nerve then passes down on the outer side of the brachial artery,, 

 and crosses over it to the inner side, at the level of the inferior 

 profunda branch about the middle of the arm. At the elbow it 

 lies on the inner side of the artery beneath the bicipital fascia 

 and the median basilic vein, and passes into the forearm between 

 the two heads of pronator radii teres, the deep head of which 

 separates the nerve from the ulnar artery. The nerve then 

 passes down the forearm between the superficial and deep 

 muscles, and enters the palm of the hand beneath the anterior 

 annular ligament on the outer side of the flexor tendons. In the 



