The Journal of nervous and mental disease . s). This splitting up of the fibre can in some placesbe traced into extremely minute fields, and in many in-stances is marked to such a degree that comparativelywide gaps are seen between the angular fields. Here andthere also entire fields have dropped out, leaving largegaps behind. This latter feature is not infrequently seenalong the periphery of some of the fibres, particularly insuch cases where the fibre has been mechanically draggedout from its continuity with the adjacent fibres. Thisfeature is also alluded to by Erb. The sarcous elements are
The Journal of nervous and mental disease . s). This splitting up of the fibre can in some placesbe traced into extremely minute fields, and in many in-stances is marked to such a degree that comparativelywide gaps are seen between the angular fields. Here andthere also entire fields have dropped out, leaving largegaps behind. This latter feature is not infrequently seenalong the periphery of some of the fibres, particularly insuch cases where the fibre has been mechanically draggedout from its continuity with the adjacent fibres. Thisfeature is also alluded to by Erb. The sarcous elements are also seen to be much more THOMSENS DISEA SE. \47 uniform in size and arrangement than in the normal muscle,this being probably caused by the more general contractionof the muscular fibres (see Fig. 2), or by the uniformlysmaller size of the sarcous elements, as mentioned sections of the normal muscle, when viewedwith high power (1,200 diam.), show groups of sarcouselements, faintly separated from their neighbors by slight. Fig. 5.—Segment of a normal muscle-fibre. Quadriceps femoris. Longitudinal section. X 1200. interstices. The individual sarcous elements vary slightlyin size and, especially in some of the muscle-fibres whichapparently are not in a state of intense contraction, areseen to be distinctly connected with the adjacent elementsby means of conical threads. These threads also tra-verse the interstices between the groups of the sarcouselements, and this connection is so well marked that in theentire field of a fibre not a single interruption between in- 148 GEORGE W. JACOB Y. dividual sarcous elements and groups of elements isvisible. Muscle-fibres which are evidently in a state of intensecontraction show the sarcous elements lying close againsteach other, so that even when the short threads cannot bemade out, a direct continuity is seen to be present by theimmediate contact of the sarcous elements between them-selves. Whenever a nucleus is seen at
Size: 1288px × 1939px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1870, booksubjectpsychologypathologic
