File:A text-book on physiology - for the use of schools and colleges - being an abridgment of the author's larger work on human physiology (1866) (14767874912).jpg

Identifier: textbookonphysio00drap (find matches)
Title: A text-book on physiology : for the use of schools and colleges : being an abridgment of the author's larger work on human physiology
Year: 1866 (1860s)
Authors: Draper, John William, 1811-1882
Subjects: Human physiology Physiology
Publisher: New York : Harper & Bros.
Contributing Library: Francis A. Countway Library of Medicine
Digitizing Sponsor: Open Knowledge Commons and Harvard Medical School

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:
ing the origin Nerve-cells, magnified 350 di- Bipolar nerve-cell, magnifiedameters. 350 diameters. Describe the composition of vesicular substance.77 indicate ? What does Fig. 214 BIPOLAR AND MULTIPOLAR NERVE-CELLS. of a fibre; a, sheath of the cell and nerve-tube, contain-ing nuclei; b, cell membrane of the nerve-cell. 2. Cell,with the origin of a fibre without sheath; b, cell mem-brane of the nerve-cell. 3. Nerve-cell, deprived, in thepreparation of it, of its membrane and external sheath. Fig. 78 (page 213), bipolar nerve-cell of the pike, con-tinued at each end into nerve-tubes. «, sheath of thenerve-cell; #, sheath of the nerve; c, medulla; d, axiscylinder continuous with the contents of the nerve-cell,e, which have shrunk away from the sheath after actionby arsenious acid. Fig. 79, caudate nerve vesicle of the multiple kind:a, the nucleated vesicle; #, its processes. These prob- 79.
Text Appearing After Image:
Multipolar nerve-cells, magnified 200 diameters. ably are continuous with the axis cylinders of the nerves,in connection with the vesicle. FUNCTIONS OP NERVE FIBRES. That the function of nerve fibres is to conduct impres-sions, is proved by many different facts. On putting aligature round a nerve, or cutting it across, it no longertransmits the usual influences. A more critical exam-ination shows that impressions made on the external ex-tremities of a nerve are conveyed by it to the centres,and the influences originating in the nervous centres areconducted along such trunks to the parts to which theyare distributed. This double duty therefore implies What are unipolar, bipolar, caudate vesicles ? What is the func-tion of nerve fibres ? What is the effect of a ligature or section of anerve ? CENTRIPETAL AND CENTRIFUGAL FIBRES. 215 that there are two classes of fibres, the centripetal andcentrifugal, though thus far no structural difference be-tween them has been detected. They can not

Note About Images