272 



M US OLE- TISS UE. 



of Max Schultze. They are evidently remnants of the embryonal 

 development, " undifferentiated protoplasm," as M. Schultze 

 himself said. They often fall out, especially from very thin 

 sections, and leave one more central or two more peripheral 

 openings, bounded by a jagged or stellate outline. 



The formations termed nuclei really reveal the history of 

 development of the muscle-fiber. Each fiber is constructed on the 

 plan of a bundle of connective tissue for example, the tendon. It 

 is likewise composed of one large or a number of smaller territories, 

 and each territory has resulted from the coalescence of a number 

 of plastids, some or portions of which remain unchanged solid or 

 granular Moplasson, while in all surrounding plastids the points 



of intersection of the bioplasson re- 

 ticulum assume the regular ar- 

 rangement of sarcous elements. 

 At the borders of the territories 

 sometimes a layer of elastic sub- 

 stance is formed, and a whole 

 system of territories is, as a rule, 

 ensheathed by a solidified, so- 

 called elastic substance, the sar- 

 colemma, an offspring of the bio- 

 plasson liquid. Th. Mar go was 

 the first observer who proved 

 positively that each muscle-fiber 

 arises from a number of plas- 

 tids, the so-called " sarcoplasts," 

 against the view inaugurated by 



LoN " Schwann, that a single muscle- 

 CHROMIC , , 



fiber is an enormously grown 



" cell." 



In some places the muscle- 

 fibers have been found bifurcat- 



FIG. 116. MUSCLE OF THE HEART 

 OF A NEWLY BORN CHILD. 

 GITUDINAL SECTION. 

 ACID SPECIMEN. 



NN, nuclei on the surface of the nmscle- 

 nber ; CP, delicate perimysium, with oblong 

 nuclei and capillary blood-vessels. Magni- 

 fied 500 diameters. 



ing, f. i., in the tongue, the 

 muscles of the eyeball, and the heart. In the heart the muscle- 

 fibers are very small, freely branching, and united into bundles 

 in the manner of a felt- work. It was said before that here the 

 sarcous elements are extremely small, while the nuclei are very 

 numerous. This is the only muscle which for eighty or more 

 years is in continuous activity the first to begin and the last to 

 stop. (See Fig. 116.) 



The medullated motor nerves, upon entering the muscle, split 

 into numerous branches, which course in a transverse or oblique 



