MUSCLES. 



the tendons of the two adhere closely, but have a bursa between* 

 them at their termination. That portion of the tendon of the 

 latissimus which is continuous with the lower edge of its fleshy 

 belly, by a half spiral turn in the latter, becomes uppermost ; 

 while the upper portion is by the same arrangement made 

 lowest. At the place of its insertion, it is commonly connected 

 to the pectoralis* major. The inferior margin of its tendon de- 

 taches a slip to the brachial fas<?ia, and the superior margin 

 another to the smaller tuberosity of the os humeri. 

 It draws the os humeri downwards and backwards.* 

 The thick tendinous membrane coming from the spinous pro- 

 cesses of the loins and back is the fascia lumborum, and is com- 

 mon to the latissimus the internal and external oblique muscles 

 of the abdomen, and several other muscles to be mentioned. 



The Serratus Inferior Posticus. 



The origin of this muscle is inseparably united to that of the 

 latissimus dorsi by the fascia lumborum, and comes from the 

 two inferior spinous processes of the back., and.the three superior 

 of the loins. 



It is inserted by fleshy digitalions into the under edge of the 

 four inferior ribs. 



It draws the ribs downwards, and is an antagonist to the dia- 

 phragm in some respects, but more particularly to the serralus 

 superior posticus. 



The removal of the trapezius brings into view several mus- 

 :les; the most superficial of which are the rhomboid, which, 

 being two together, look very much like one. 



* Varieties. Sometimes. from its anterior extremity a fleshy or tendinous slip 

 is detached in front of the coraco-brachialis, and is inserted into the posterior 

 face of the tendon of the pectoralis major. The brachial vessels and nerves are 

 liable to compression from this arrangement, which is said to be natural to'birds 

 and moles. Another variety is where a slip runs from this muscle, adheres to 

 the coraco-brachialis, and is inserted tendinous into the coracoid process .of the, 

 scapula. 



