204 



THE MUSCLES. 



of the spinous processes of all the lumbar and the last fourteen or fifteen 

 dorsal vertebrae -fixed insertion of the muscle. 



The fibres of the fleshy portion are detached from the inferior border 

 of the aponeurosis, at the twelth or thirteenth ribs, to the cartilage of 

 the scapula. They are directed forwards and downwards, and all converge 

 into a flat tendon which is inserted into the internal tuberosity on the 

 body of the humerus movable insertion. This tendon is remarkable, at its 

 termination, for being placed at the external face of the teres magnus or 

 adductor of the arm, from which it receives fibres, and between it and the 

 long extensor of the fore-arm; it then turns inwards, on the inferior 

 extremity of the first, in such a manner that this extremity is comprised 



Fig. 105. 



MUSCLES OP THE SPINAL REGION OF THE NECK, BACK, AND LOINS, MIDDLE LAYER; 

 AND OF THE COSTAL AND ABDOMINAL REGION, SUPERFICIAL LAYER. 



1, 2, Rhomboideus ; 3, Angular muscle of the scapula ; 4, Splenius 5, Its mastoid 

 aponeurosis ; 6, Mastoid portion of the small complexus ; 7, Its tendon ; 8, Cer- 

 vical insertions of the mastoido-humeralis ; 9, Atloidean tendon common to the 

 mastoido-humeralis, splenius, and small complexus; 10, Great anterior straight 

 muscle of the head; 11, Inferior scalenus ; 12, Superior scalenus; 13, Small 

 anterior serratus; 14, Posterior ditto; 15, Great serratus ; 16, Transverse 

 muscle of the ribs; 17, One of the external intercostals ; 18, Great oblique 

 muscle of the abdomen ; 20, Straight muscle of the abdomen ; 21, Stylo-maxil- 

 lary portion of the digastric muscle. 



within a duplicature of the membranous tendon of the latissimus dorsi 

 (Fig. 121). 



Relations. This muscle is covered by the skin, panniculus carnosus, 

 dorsal portion of the trapezius, and the mass of olecranian muscles. It 

 covers the infraspinatus ; the cartilage of the scapula ; the rhomboideus ; 

 the small anterior and posterior serrated muscles, whose aponeurosis is 

 directly joined to its own ; the ilio-spinalis ; the principal gluteal ; a portion 

 of the external surface of the last ribs, to which its aponeurosis strongly 

 adheres ; as well as the corresponding external intercostals, and the great 

 serrated muscle. Between the last rib and the external angle of the ilium, 



