62 THE UPPER EXTREMITY 



bands, which are placed in relation to the transverse artery of 

 the scapula and the suprascapular nerve. The upper transverse 

 ligament of the scapula bridges across the incisura scapulae and 

 converts it into a foramen. It lies between the transverse 

 artery of the scapula and the suprascapular nerve : the former 

 being placed above it, and the latter below it. Not infrequently 

 it is ossified. The inferior transverse ligament of the scapula 

 is a weaker band; it bridges across the transverse artery 

 of the scapula and the suprascapular nerve as they pass 

 through the great scapular notch. On the one hand, it is 

 attached to the lateral border of the spine of the scapula, and 

 on the other, to the back part of the neck of the scapula. 



FRONT OF THE ARM. 



In this dissection the following parts have to be 

 studied : 



1. Cutaneous vessels and nerves. 



2. Brachial aponeurosis. 



3. Brachial artery and its branches. 



4. Median, ulnar, radial, and musculo-cutaneous nerves and branches of the 



last two. 



5. Biceps, coraco-brachialis, and brachialis muscles. 



In conjunction with this dissection, it is convenient to 

 study the triangular space in front of the elbow, and also to 

 trace the cutaneous nerves to their ultimate distribution in 

 the skin of the forearm. 



Surface Anatomy. In a muscular limb the prominence 

 formed by the biceps muscle along the front of the upper 

 arm is very apparent. Every one is familiar with the rounded 

 swelling which it produces when powerfully contracted in the 

 living subject. On either side of the biceps there is a feebly 

 marked furrow, and ascending in each of these there is a 

 large superficial vein. In the lateral furrow is the cephalic 

 vein ; in the lower part of the medial furrow the basilic vein. 

 In the upper part of the medial bicipital sulcus is an 

 elongated bulging produced by the subjacent coraco-brachialis 

 muscle. This is useful as a guide to the lower part of the 

 axillary and the upper part of the brachialis arteries, which lie 



