File:General physiology of muscles and nerves (1881) (14775317624).jpg

Identifier: generalphysiolo00rose (find matches)
Title: General physiology of muscles and nerves
Year: 1881 (1880s)
Authors: Rosenthal, I. (Isidor), 1836-1915
Subjects: Physiology Muscles Nerves
Publisher: New York, D. Appleton and company
Contributing Library: Columbia University Libraries
Digitizing Sponsor: Open Knowledge Commons

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:
cularpulsation thus produced will, however, in this case beindicated on the rapidly moving glass plate, with theresult of giving, not a simple vertical stroke, but acurved line. The distance of the point of commence-ment from the vertical stroke expresses the latentirritation. If, instead of irritating the muscle itself, a point 114 PHYSIOLOGY OF MUSCLES AND NERVES. in the uerve is exposed to the irritation, the muscle inthis case also describes the curve of its pulsation onthe rapidly moved plate of the myograph. Arrangingmatters so that two curves of pulsation are allowedto describe themselves in immediate sequence, but withthe difference that the nerve is irritated in one case ata point near the muscle, but in the other case at apoint far from the muscle, two curves will be obtainedon the plate of the myograph, which will appear ex-actly alike but yet will not cover each other. On thecontrary, they are everywhere somewhat separatedfrom each other, as is shown in figure 29.^ In this
Text Appearing After Image:
0 Fig. 29. Pi;opagation of the excitement within nehves. figure, a 6 c is the curve first described, on irritationof the nearer portion of the nerve; in order to dis-tinguish it from the other it is marked by small nicks;a h c represents the curve indicated immediately afterthe former, but obtained as the result of the irritationof a portion of the nerve remote from the muscle. Thesecond curve is seen to be somewhat separated from theother; it does not commence so soon after the momentof irritation (which is indicated by the vertical stroke o);that is, a longer time elapsed between the moment of The curves in fig. 29 wore described when the g)ass platemoved more rapid!j-. so that they appear more extended than thoserepresented in figure 18. TKAKSMISSION OF THE EXCITEMENT. 115 irritation and the pulsation of the muscle in the lattercase than in the former; and this diflference evidentlydepends only on the fact that in the latter case theexcitement within the nerve had to traverse a lon

Note About Images