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Vol. VIII. DETROIT, SEPTEMBER, 1888. No. 9 



ORIGINAL COMMUNICATIONS. 



FORM, ENDINGS AND RELATIONS OF STRIATED, MUSCU- 

 LAR FIBERS IN THE MUSCLES OF MINUTE 

 ANIMALS (MOUSE, SHREW, BAT AND 

 ENGLISH SPARROW.)* 



[two PLATES.] 

 SUSANNA PHELPS GAGE, PH. B. 



PART II. 



I HE question of the form of muscular fibers is comparatively 

 -^ easy to solve. Their relations present a much more difficult 

 problem. 



11. Arrangement and Connection of Fibers. — In Sec. 1-6, 

 Part I, and Figs. 1-9, PI. VIII, an idea is given of the general 

 arrangement of fibers with reference to each other in the ordinary 

 muscles. In the study of serial sections and dissected prepara- 

 tions, it is seen that fibers from the opposite tendons lap to a 

 greater or less extent, and are applied closely to each other. 



In the biceps femoris* of the mouse, a small fascicule of five 

 fibers was traced through a large number of serial sections, when at 

 about the middle of the muscle, three fibers of small diameter 

 appeared and gradually increased in size, the original five gradually 

 becoming smaller, disappeared, leaving only the three fibers which 

 now were of full size and continued toward the opposite tendon. 



* The name vastus externum, oceuriug in Part [, shoull be rpplace'1 by biceps ff maris, 

 as the ini'.scle in question se^-ms to agree more closely wi.h th-- hicep'^ femoris of the rablj.t 

 than with the vastus externus of man. See Krause's Anatomie des Kduiuchens. 



