MUSCLES OF THE AHM. 



213 



tendon of* insertion. This tendon, slightly twisted upon itself as it descends, 

 is inserted into the rough posterior margin of the tuberosity of the radius, 

 and glides on the anterior smooth surface of that process by the inter- 

 vention of a synovial bursa. From the front of the lower part of the muscle, 

 arid from the tendon at its inner side, there proceeds a fibrous expansion of 

 an aponeurotic nature, which passing downwards and inwards becomes 

 blended with the fascia of the forearm over the pronator radii teres. 



Fig. 178. DEEP VIEW OF THE 



MUSCLES OF THE RIGHT SHOULDER 



AND ARM, FROM BEFORE. 



Fig. 178. 



The clavicle is divided near its 

 middle ; the pectoralis minor is 

 entirely removed, and portions of 

 the biceps, pectoralis major, del- 

 toid, and latissimus dorsi, are left 

 near their attachments, a, acro- 

 mion ; 6, cut part of the clavicle ; 

 c, coracoid process ; d, upper, and 

 e, lower triangular space left at 

 the upper and lower angles of the 

 scapula on its anterior surface when 

 the serratus magnus is removed ; 

 /, great tuberosity of the humerus ; 

 <7, surface of the humerus below 

 the bicipital groove, near the ridge 

 of attachment of the pectoralis 

 major and deltoid muscles ; h, 

 outer, and i, inner condyloid emi- 

 nence of the humerus ; 1, cut 

 coracoid head, and 1', cut glenoid 

 tendon, of the biceps muscle ; 2, 

 folded tendon of insertion of the 

 pectoralis major, of which one por- 

 tion is seen running up to the bici- 

 pital groove ; 3, lower cut end of 

 the deltoid ; 4, coraco-brachialis 

 muscle ; 5, subscapularis ; 5', its 

 insertion into the lesser tuberosity ; 

 6, teres major ; 6', its insertion 

 behind and below the latissimus 

 dorsi ; 7, part of the latissimus 

 dorsi ; + , slip proceeding from the 

 inferior angle of the scapula ; 7', 

 insertion of the tendon, after wind- 

 ing round the teres major, in front 

 of and higher than that muscle ; 

 8, 8', brachialis anticus ; 9, long or 

 scapular head of the triceps, at the 

 upper part seen between the teres 

 major and subscapularis muscles, 

 the teres minor not represented ; 9', 

 inner humeral head of the triceps ; 

 10, flexor communis digitorum pro- 

 fundus, taking origin round the in- 

 sertion of brachialis anticus ; 11, tendon of insertion of the biceps. 



Concealed above by the deltoid and pectoralis major muscles, the bleeps forms in 

 the rest of its extent the prominence of the front of the arm. It rests in its upper 

 half on the humerus, and in its lower on the brachialis anticus, and by its inner 

 margin is in contact in its upper half with the coraco-brachialis, in its lower with the 



