THE MUSCLES. 159 



externus scapula (behind), united with the preceding muscle. 

 Ins. : tuberculum inajus (inferior fossa) ; vertical, strong tendon, 

 1" broad. Use : like the preceding; to draw the arm backwards, 

 and lower it, if raised ; prevents the escape of the head of the hu- 

 merus backwards. 



Nerves: axillaris [circumflexus]. 



289. 5. Teres Major. 



Pos. : at the. inferior external border of the preceding muscle, 

 before Cap. long, tricipitis; assists in forming the posterior border 

 of the axillary fossa. Or. : Margo extern, and Jingul. inferius 

 Scapulae, united with latissimus dorsi. Ins. : Spina tuberculi 

 minoris ; two inches broad, behind the tendon of latissimus. 

 Use: to rotate the arm inwards, drawing it backwards towards 

 the central line (like ani scalptor}. 



Nerves: axillar. and suprascapularis. 



290. 6. Subscapularis. 



Pos. : on the anterior surface of Scapula, between the external 

 third of which and it; cellular tissue and Vasa and Nn. subsca- 

 pulares. Before it: M. serratus ant. magn., Vasa and Nn. axil- 

 lares, Mm. coraco-brachial. and deltoides. Or. : fossa scapularis 

 (two-thirds of the surface). Ins. : tuberculum minus oss. humeri. 

 Its tendon glides in the concavity of Proc. coracoid., between 

 the tendons of M. biceps and coraco-brachialis, as in a pulley. 

 Use : to rotate the arm inwards, drawing it downwards. 



Nerves: subscapulares. 



Fascist Scapulas. 



291. 1. F. supraspinata, is firmly attached to the borders 

 of the fossa supraspinata, encloses the muscle, and loses itself 

 externally beneath Jlcromion and Proc. coracoideus. 



2. F. infraspinata, fixed to the borders of fossa infraspin., 

 covers and separates the Mm. infraspinal., teres minor and 

 major ; loses itself externally in the/, brachialis, since a super- 

 ficial layer covers M. deltoideus, a deep, the tendon of M. infra- 

 spinatus, and attaches itself to the tendon of Caput breve m. bici- 

 pitis. 



3. F. subscapularis ; covers the muscle of the same name, 

 and is connected on the borders of fossa subscapularis with the 

 preceding and with/, lumbo-dorsalis. 



