. Compendium of histology. Histology. 84 EIGHTH LECTURE. The former consist of sarcous elements (a*) placed nearer each other. This may also be recognized without trouble by the aid of good and strong magnifying powers. They are elon- gated prismatic bodies, measuring nim. in the proteus, m the frog, to mm. in the mammalia and man. The sarcous elements must, naturally, be joined one to the other. If we split off one of the finest longitudinal filaments, that is a so-called muscular fibrilla (1), the longitudinal series of sarcous elements (a) are held together by th
. Compendium of histology. Histology. 84 EIGHTH LECTURE. The former consist of sarcous elements (a*) placed nearer each other. This may also be recognized without trouble by the aid of good and strong magnifying powers. They are elon- gated prismatic bodies, measuring nim. in the proteus, m the frog, to mm. in the mammalia and man. The sarcous elements must, naturally, be joined one to the other. If we split off one of the finest longitudinal filaments, that is a so-called muscular fibrilla (1), the longitudinal series of sarcous elements (a) are held together by the transparent longitudinal connecting medium (b). If we examine a mus- cular filament split up into transverse plates, the dark and light transverse zones are found to be connected by a trans- verse connecting substance, which extends over the outer surface from a and b of our Fig. 78, 2. Here the longitudinal connection is naturally, completely dissolved. Up to about ten years ago, we thought the matter might thus be passably explained; but newer observa- tions have been added and further doubts have arisen. In the year 1863, the Englishman, Martyn, had already seen a dark trans- verse line in the transparent longitu- dinal connecting medium. These ob- servations were afterwards corroborat- ed and extended by Krause (Fig. 79). Let us name this thing (a), therefore, Krause's transverse line or disc. But with this we have still not reached the end. At the same time another competent investigator, Hen- sen, found the dark transverse zone, the transverse series of sarcous elements, divided by a transparent transverse This is the Hensen's middle disc. Granules which. Fig. 79.—Krause's transverse discs ; a, a, i, a muscular fibrilla without; 2, one with strong longi- tudinal traction, both very strong- ly enlarged (Martyn) ; 3, muscu- lar filament of the dog imme- diately after death. line. were contiguous above and below to Krause's transverse line. Please note that these images
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