300 



Muscles of the Arm. 



Ligamentum acromioclaviculare 

 Processus coracoideiis | 



Acromion 



Bursa liganienti coracoclavicularis 

 Clavicula (cut through) 



Ligamentum 

 coraooacromiale 



Bursa subacromialis 



Bursa m. 

 coracobrachialis 



Bursa 

 subdeltoidea 



Tondo m. latissimi dorsi 



(cut through and 



reflected) 



Bursa m. latissimi dorsi 



Crista tubei'culi minoris 



Humerus 



Angulus niedialis 



- M. subscapularis 



M. teres major 



345. Muscles of the right shoulder-blade, 



viewed from in front. 



M. subscapularis (see also Figs. 343 and 347). Form: flat, triangular. Position: 

 hi^liind the ra. serratus anterior-, it fills up the fossa subscapularis and passes ininiediately in 

 front of the shoulder joint. Origin: facies costalis scapulae and fascia subscapularis (see 

 below), very penniforra. Insertion: the fibers converge upward and lateralwai'd and are 

 attached by a short powerful tendon to the tuberculuni minus and crista tubereuli minoris of 

 the humerus; on the posterior surface they are fused with the capsula articularis humeri; 

 there the bursa m. siihscapu/aris is fuuntl (see p. ISO and Fig. 346). Action: it draws 

 the arm nuMlianward and mils it inward. Innervation: nn. subscapulares. 



The fascia subscapularis (not shown in drawing) covers the anterior surface of the 

 m. subscapularis, is connected lateralward with the continuation of the fascia brachii, which 

 covers tlie m. coracobrachialis (see also Fig. 344). 



M. teres major (see also Figs. 329, 330, 343 and 346351). Form: flat-cylindrical. 

 Position: at the margo axillaris of the shoulder-blade, in front covered by the tendon of the 

 m. latissiums dorsi, behind and lateralward partly by the m. latissimus dorsi, partly by the 

 ni. deltoideus and caput longum m. tricipitis brachii. Origin: facies dorsahs of the angulus 

 inferior scapulae. Insertion: the fibers run parallel upward and lateralward and are at- 

 tached by a strong tendon to the crista tubereuli minoris. There, between the tendon and 

 the bone, lies tlic bursa m. teretis majoris (not shown in drawing). Action: it draws 

 tht> arm mediauward and liackward. Innervation: nn. subscaptdares. 



Bursa ligameuti coracoolaricularis, small, often present, between the lig. trape- 

 zoideum and the lig. cdnnidiMim ol' the lig. coracoclaviculare. 



Bursa subacroniialis, laige, almost constant, between the acromion and the lig. 

 coracoacromiale on tlie one hand and the capsula articularis of the shoulder joint and the 

 m. su])ras])inatus on tlie other. It often coramunicat(>s with the following bursa. 



Bursa subdeltiudea, large, almost constant, between the m. deltoideus and the tuber- 

 culuni inajiis hunifri, often coiunuinicating with the preceding bursa. 



Bursa m. coracobrachialis, of moderate size, almost constant, situated in front of 

 the upper part of the tendon of the m. subscapularis, between it, the proc. coracoideus and 

 the tendon of the m. coracobrachialis. 



Bursa lu. latissimi dorsi, fairly large, oblong, constant, between the tendon of the 



m. latissimus dorsi and that of tlie m. teres 



major. 



