416 MUSCLES. 



The Teres Major, 



Is situated at the inferior edge of the teres minor. It arises, 

 fleshy, from the posterior surface of the angle of the scapula, 

 and from a small part of its inferior costa ; the interstice be- 

 tween it and the teres minor is considerable. 



It is inserted, by a broad tendon, into the internal ridge of 

 the groove of the os humeri, along with the tendon of the la- 

 tissimus dorsi. Their tendons, at first, are closely united, but 

 afterwards there is an intermediate cavity lubricated with sy- 

 novia. The tendon of the latissimus dorsi is anterior, and the 

 lower edge of the teres extends farther down the arm than it. 



It rolls the humerus inwards, and draws it downwards and 

 backwards. 



The Subscapularis, 



Occupies all the thoracic surface of the scapula, being be- 

 tween it and the serratus major. It arises, fleshy, from the 

 whole base, superior and inferior costa, and costal surface of 

 the scapula; it is divided into several columns, which look some- 

 what like distinct muscles, but they all terminate in a thick ro- 

 bust tendon that adheres to the inferior surface of the capsular 

 ligament. 



This tendon is inserted into the lesser tuberosity of the os hu- 

 meri. 



The subscapularis rolls the bone inwards and draws it down- 

 wards. Between it and the neck of the scapula, there is a 

 bursa, which, as mentioned, communicates with the articula- 

 tion. 



SECT. III. OF THE MUSCLES OF THE ARM. 



Tfie Biceps Flexor Cubiti. 



This muscle is just beneath the fascia and integuments, 

 and forms the swell so obvious in the middle front part of the 



