MUSCULAR TISSUE. 



85 



F11, 80.— Piece ' f a 

 dead muscular til 1- 

 ment from the fly, after 

 Engelmann ; a, trans- 

 verse discs ; />, acces- 

 sory discs. 



were subsequently designated by Engelmann as accessory 

 discs (Fig. 80 b). 



From these singular observations, which 

 touch and, perhaps, in part, exceed the limits 

 of microscopic analysis, we are at present un- 

 able to derive an anyways reliable conclusion. 



An old observation of Bruecke's is also in- 

 teresting. The Bowman's sarcous elements 

 refract the light double, the longitudinal con- 

 necting medium refracts simply. 



We pass, finally, to some more simple structural conditions 

 of the transversely striated muscle. 



Among these are the so-called interstitial granules, small 

 fat molecules (Fig. JJ, d), which, commencing at the nuclear 

 poles of the muscular corpuscles, permeate the filament in a 

 linear longitudinal direction over shorter or longer distances. 



The preparation of transverse sections 

 through the frozen muscle (Fig. 81) was taught 

 by Cohnheim. Groups of sarcous elements 

 {a) are here recognized as a mosaic of small 

 areas of transverse to hexagonal shape. 

 Enclosing these are noticed a system of 

 transparent, glistening lines (c) which must 

 belong to the transverse connecting medium. 



A modification of the transversely striated 

 muscles is met with in the tongue and heart 

 of the mammalia and man. These are rami- 

 fied and reticularly connected filaments. In 

 the former organ are noticed frequently sarcous elements : c, 



*■ J transparent trans- 



repeated divisions at aCUte angles. verse connecting me- 



r ° dium ; 0, nucleus. 



In the heart (Fig. 82), a narrow-meshed 

 net-work is constituted by the abundant formation of anasto- 

 moses. A sarcolemma is probably wanting in these dimin- 

 ished filaments. The latter, furthermore, show strongly pro- 

 nounced transverse and longitudinal markings. It is an 

 interesting circumstance, finally, that this muscular reticulum 

 consists of cemented cells (Fig. 82, to the right). 



Fig. 81.— Trans- 

 verse section through 

 a frozen muscle of 

 the frog ; a, groups of 



