. Anatomischer Anzeiger. Anatomy, Comparative; Anatomy, Comparative. 179 answered. At the best the solution is exceedingly difficult. The delicacy of the cell wall, the overlying or underlying of it by muscle fibrillae, granulae, and telophragmata, all add to the difficulty in answering the question. The middle of the three muscle cells in fig. 1, however, possibly presents evidence upon which a correct conclusion may be drawn. The uppermost pole of this cell demon- strates what appears to be the reflected edge of the cell wall. The instance is not exceptional, since many such appearances are
. Anatomischer Anzeiger. Anatomy, Comparative; Anatomy, Comparative. 179 answered. At the best the solution is exceedingly difficult. The delicacy of the cell wall, the overlying or underlying of it by muscle fibrillae, granulae, and telophragmata, all add to the difficulty in answering the question. The middle of the three muscle cells in fig. 1, however, possibly presents evidence upon which a correct conclusion may be drawn. The uppermost pole of this cell demon- strates what appears to be the reflected edge of the cell wall. The instance is not exceptional, since many such appearances are demon- strable throughout the entire series of sections. But the possibility of its being an obliquely-sectioned cell extremity together with the difficulties enumerated above render, with our present microscopical technic, a posi- jg?d i tive answer most injudicious. ftj Two muscle fibres, represented as transversely sectioned, are seen in figure 2. A blood vessel occupies the angle between them. Each fibre presents a muscle cell. That on the left was encountered at the level of the middle of the nucleus; that • on the right above the level of that structure. In the latter the structure of the cell protoplasm is in marked contrast to that of the sarcoplasm. The presence of a cell wall separating the two is un- questionable. The spongioplasm network of the cell is relatively heavily laden with granules. Notwithstanding, the clear Pig j fibrillae of this network can in many levels be traced directly up to the internal surface of this cell wall upon which they end. They do not at any place find an insertion upon the muscle fibrillae. A narrow interval of sarcoplasm, equal in general to the cross-diameter of an average muscle fibril, intervenes between the latter and the cell wall. The cell on the left is of interest chiefly because it demonstrates appearances comparable to those observed in connection with similarly cut sections of voluntary striped muscles. The remarks made in
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Keywords: ., bookcentury1900, bookdecade1910, bookpublisherjenag, bookyear1912
