File:The brain as an organ of mind (1896) (14597249499).jpg

Identifier: brainasorganofmi00bast (find matches)
Title: The brain as an organ of mind
Year: 1896 (1890s)
Authors: Bastian, H. Charlton
Subjects: Brain Nervous System Physiology Brain Nervous system Psychology, Comparative
Publisher: New York : D. Appleton and Company
Contributing Library: University of Connecticut Libraries
Digitizing Sponsor: University of Connecticut Libraries

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Fig. 7.âThe Cervical Plexus, composed by interlacements of the last four cervica(1, 2, 3, 4) and the first dorsal nerves (5). The various branches (6-21) are distributedto the shoulder, arm, fore-arm, and hand. (Sappey after Hirschfeld.) * speak here only of probability, as this is a subject neces-sarily beyond the reach of actual observation. Nerve Cells vary much in size and shapeâthe smallestbeing about g^Q^-Qth, whilst the larger may be 3-^o^h ofan inch or more in diameter. They are more or lessgranular bodies, each of which contains a large nucleus,and within this an unusually distinct nucleolus (figs.1 and 8). Near the nucleus a heap of yellowish ororange coloured pigment granules may often be seen. Thesubstance of the cell is continued into two or many pro- 86 THE STRUCTURE OF
Text Appearing After Image:
Fig 8 -Gu., Processes ahroptly broken off. a. The axis eyhnder proee.s.M.ijfnificd al.nnt SOO .li.unacrs. (Max Hdn.lt/e.) CnAP. II.) A NERVOUS SYSTEM. 37 cesses, whicli are either much branched (fig. 12)(ramifymg processes) or simple. It is by means of thesedifferent kinds of processes that nerve cells are unitedto the central extremities of the nerve fibres and to oneanother. It is worthy of note that the substance, both ofthe nerve cell and of its processes, when examined underhigh magnifying powders can often be seen to be dis-tinctly fibrillated in the same manner as the axis band *of a nerve fibre, with which, or with the ramifications ofwhich, some o^ these processes are continuous. If the fibrillations of the axis band, and of the nerveprocess into which it may be continued, correspond withfunctionally if not structurally distinct fibrilsâthat is, withseparate paths for stimulus wavesâ

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