THE LIMBS OF THE HOESE 



27 



reasonable to regard both portions as representing the pars scapularis 

 only. 



Dissedion.~Cut across the deltoid within a short distance of its 

 insertion and turn it aside as far as possible without, however, 

 endeavouring to remove its tendinous origin from that part of the 

 mfraspinous muscle to which it is closely adherent. This dissection 

 exposes the teres minor muscle, the origin of the lateral head of the 



M. suprasplnatus. M. pectoralis protundus. 



M. suprasplnatus. 



II. infraspiDatus. 



M. teres minor. 



M. deltoideus. - 



M. brachiocephalicus 



M. extensor carpi radialis. 



M. subscapularis. 



M. brachialis. 



HI -T-- *^^- teres major 

 / ifr J et latissimus dorsi. 



M. coracobrachialis. 



Mm. extensor digitorum 

 communis et extensor 

 carpi radialis. 



Pig. 14. — Anterior Aspect of the Humerus, with Areas of Muscular Attachment. 



triceps, and the axillary nerve as it appears, along with the posterior 

 circumflex vessels, from the narrow, triangular space bounded by the 

 long and lateral heads of the triceps and the teres minor. 



M. INFRASPINATUS. — The infraspinous ^ muscle occupies the fossa 

 of the same name. Its origin is from the whole of the fossa, and 

 also from the aponeurotic origin of the teres minor muscle. As 



1 Infra [L.J, beneath. Spina [L.], a low wall dividing the circus lengthwise. 

 In man the muscle lies beneath the spine of the scapula. 



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