BICEPS FLEXOR CUBITL 



20& 



inserted into a supracondylar process. The middle division of the muscle is most 



constant in man : but is generally accompanied by a part of the third ; the 



musculo-cutaneous nerve passing between them. The first and third constitute 



the most marked varieties in man, and all three are found in various foiTus 



and degrees of development in different animals. The internal brachial ligament 



of Struthers is a fibrous band 



connected with the inferior part Fig. 172. 



of this muscle. (John Wood, -, 



on Hum. Muse. Variations, (tc, " 



Joum. of Anat. vol. i. p. :lo.) 



Fig. 172. — Dekp view of thk 

 Muscles op tub Right Shoul- 

 der AND Arm, from before. 

 (A. T.) 1 



a, b, outer half of the divided 

 clavicle ; c, coracoid process ; d, 

 upper, ande, lower triangular space 

 left at the upper and lower angles 

 of the scapula on its anterior sur- 

 face to which the seiratus magnus 

 is attached ; /, great tuberosity of 

 the humerus ; ;/, surface of the 

 humerus below the bicipital 

 groove ; //, outer, and i, inner 

 condylar eminence of the humerus; 

 1, cut coracoid head, and 1', cut 

 glenoid tendon of the biceps mus- 

 cle ; 2, folded tendon of insertion 

 of the pectoralis major, of which 

 one portion is seen running up to 

 the bicipital groove ; 3, lower cut 

 end of the deltoid ;4,coraco-brachi- 

 alis ; 5, subscapularis ; 5', its 

 insertion into the lesser tuberosity; 

 H, teres major ; 6', its insertion 

 behind and below the latissimus 

 dorsi ; 7, part of the latissimus 

 dorsi ; + , slip from the inferior 

 angle of the scapula ; 7', insertion 

 of the tendon, lifter winding 

 I'ound the teres major, in front of 

 and higher than that muscle ; 

 8, 8', lirachialis anticus ; 9, long 

 head of the triceps, at the ujjper 

 part seen in the interval between 

 the teres major and subscapularis 

 muscles ; 9', inner head ; 10, 

 tlexor communis digitorura pro- 

 fundus ; 11, tendon of insertion of 

 the bicei^s. 



The biceps flexor cubiti muscle has two heads of orif^in : one of 

 these, the internal or short head, arises conjointly with the coraco- 

 brachialis from the coracoid process of the scapula by a tendon which is 

 soon continued into muscle ; the other, the \on<x head, arises by a 

 rounded tendon from the upper border of the glenoid fossa and glenoid 

 ligament, within the capsule of the shoulder-joint, and this tendon, 

 passing over the head of the humerus, leaves the joint by the bicipital 

 groove, gradually enlarging into the fleshy head as it descends. The 

 two muscular heads, lying side by side, then unite to form, an elongated 

 and thick belly, occupying the middle and lower part of the arm : a 



