File:Hand-book of physiology (1892) (14578702497).jpg

Identifier: handbookofphysio00bake (find matches)
Title: Hand-book of physiology
Year: 1892 (1890s)
Authors: Baker, W. Morrant, (William Morrant), 1839-1896 Harris, Vincent Dormer Kirkes, William Senhouse, 1823-1864. Hand-book of physiology. 13th ed
Subjects: Physiology Human physiology
Publisher: London : John Murray
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:
ches of the sympa-thetic nerves, the wholeof the olfactory nerve,and are mingled in vari-ous proportions in thecerebro - spinal nerves.They differ from the pre-ceding chiefly in theirfineness, being only about \ to \ as large in their coursewithin the trunks and branches of the nerves; in the absenceof the double contour; in their contents being apparentlyuniform; and in their having, when in bundles, a yellowish greyhue instead of the whiteness of the cerebro-spinal nerves. Thesepeculiarities depend on their not possessing the outer layer ofmedullary substance ; their contents being composed exclusivelyof the axis-cylinder. Yet, since many nerve-fibres may be foundwhich appear intermediate in character between these two kinds,and since the large fibres, as they approach both their central andtheir peripheral end, lose their medullary sheath and assumemany of the other characters of the fine fibres of the sympatheticsystem, it is not necessary to suppose that there is any material H 2
Text Appearing After Image:
..«- s.m.p. Fig. 99.—Transverse section of the ramus visceralis ofthe vagus of skate, v.g., visceralis ganglion;m.m.f., median medullated fibres ; s.m.f., smallmedullated fibres. (T. W. Shore), IOO STRUCTURE OF THE ELEMENTARY TISSUES, (ch. III. difference in the two kinds of fibres. The non-medullated fibresfrequently branch. It is worthy of note that in the foetus, at an early period ofdevelopment, all nerve-fibres are non-medullated. Nerve-trunks.—Each nerve-trunk is composed of a variablenumber of different-sized bundles (funiculi) of nerve-fibres whichhave a special sheath (perineurium). The funiculi are enclosedin a firm fibrous sheath (epineurium) ; this sheath also sends inprocesses of connective tissue which connect the bundles together.

Note About Images