Identifier: journalofnervous14ameruoft (find matches)
Title: The Journal of nervous and mental disease
Year: 1874 (1870s)
Authors: American Neurological Association
Subjects: Nervous system Psychology, Pathological
Publisher: Baltimore (etc.) Williams & Wilkins (etc.)
Contributing Library: Internet Archive
Digitizing Sponsor: Internet Archive

View Book Page: Book Viewer
About This Book: Catalog Entry
View All Images: All Images From Book
Click here to view book online to see this illustration in context in a browseable online version of this book.

Text Appearing Before Image:
his cases, was carefully and repeat-edly sought for, but not a single specimen showed any-thing which could have been taken for them. Transverse sections of the normal muscle with the samepower exhibit marked differences in the interior of thevarious muscle-fibres. In the first place almost every fibreshows narrow angular slits, sometimes more, sometimesless numerous, which correspond to the embryonic sarco-plasts (Margo), which have entered into the constructionof the single fibre. The entire surface of the fibre appearsdotted, these dots corresponding, as is well known, to thesarcous elements of Bowman. The dots are either uni-formly scattered or are arranged in rows, the latter con-dition obviously corresponding to a slightly oblique sec- THOMSENS DISEASE. 145 tion of the fibre. In some fibres also we see the sarcouselements closely packed together and coarse in appear-ance, in others they are minute, scarcely perceptible, andare widely separated from each other, thus rendering the
Text Appearing After Image:
Fig. 4. —Myotonia congenita. Quadriceps femoris. Transverse section of a musclefibre. X 1200. appearance of the entire fibre almost homogeneous. Weeven see these variations in one and the same fibre, it beingin part coarsely, in part finely granular. Differences in thearrangement of the sarcous elements are known to exist 146 GEORGE W. JACOBY. in accordance, with the degree of contraction or extensionof the muscle-fibre. When the muscle is completely atrest, we find the sarcous elements placed at regular inter-vals and exhibiting a certain size ; this, however, varyingin different muscles and individuals. During contractionsthe size of each individual sarcous element will increaseand the interstices between them will decrease. In thestate of extension, however, the single sarcous elementswill decrease in size and the interstices between thembecome widened. If now a piece of muscle be removed from the livingbody and at once placed into a solution of chromic acid,the state of contract

Note About Images