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presents in man the downward prolongation of the scalenes which is 

 found normally in cats, dogs and other lower mammals. The direction 

 of its fibers is quite difi"erent from that of the fibers constituting the 

 fascia under consideration. Those of the muscle pass downward and 

 medialward, those of the fascia downward and lateralward. Further, 



Fig. 3. Shows the tendinous band extending very far forward. In this subject 

 there existed a cervical rib, and the m. scalenus medius was prolonged downward to 

 the second thoi'acic rib, external to the fascia and the m. serratus anterior. 



the two structures are occasionally co-existent, as in the two instances 

 above noted, where the m. scalenus medius extended to the second 

 rib once external to the fascia and m. serratus anterior, and once 

 internal to that muscle. For these reasons it seems necessary to 



11* 



