The physiology of the circulation in plants, in the lower animals, and in man : being a course of lectures delivered at the Surgeons' Hall to the president, fellows, etc. of the Royal College of Surgeons of Edinburgh, in the summer of 1872 / by J. Bell Pettigrew.

  • Pettigrew, James Bell, 1834-1908.
Date:
1874
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Licence: Public Domain Mark

Credit: The physiology of the circulation in plants, in the lower animals, and in man : being a course of lectures delivered at the Surgeons' Hall to the president, fellows, etc. of the Royal College of Surgeons of Edinburgh, in the summer of 1872 / by J. Bell Pettigrew. Source: Wellcome Collection.

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    the dark central mass of the nerve-centre and the lighter nerve-filaments in connexion therewith. A keen eye may also detect traces of the nerve-cells, which appear as dark rounded masses. To see the nerve-cells properly, the ganglion, if large, must be broken up with needles; if small, a thin covering-glass should be employed, and pressure applied with a view to flattening and even squashing it. A microscope, Fig. 151. Fig. 151 A.—Large and small terminal ganglia with nerve-cells and nerve-fibres proceeding to and from them, a, bundle of nerve-filaments in connexion with large ganglion (b). A similar bundle is connected with small ganglion (c).—Original. B. Ganglionic enlargement or swelling of nerve as it crosses a vessel, a, b, nerve-filaments proceeding to and from the ganglion and nerve-cells (c). dt nerve-substance surrounding and investing ganglion {cj. —Original. C. Large ganglion crowded with nerve-cells from coronary sinus of calf. a. b, c, d, etf, g, h, nerve- filaments proceeding to and from the ganglion and nerve-cells. The nerve-cells contain a nucleus and one or more nucleoli. They are for the most part unipolar in character. A few bipolar nerve-cells are also found.—Original. D. Unipolar (a) and bipolar (b) nerve-cells from cardiac ganglion, displaying nucleus and nucleolus.— Original. E. Terminal ganglion or aggregation of cells in a nerve as it crosses a vessel, a, nerve-filaments pro- ceeding to and from the nerve-cells of the terminal ganglion {b).—Original. magnifying from 300 to 400 diameters, will reveal the nerve- cells as represented at Fig. 151 A, B, C, D, E. These figures are copied from my Inaugural Dissertation, deposited in the Library of the University of Edinburgh in 1861, and it will be observed that they remarkably accord with analogous figures representing the ganglia and nerve-cells in the heart of the frog, published by Dr. Beale in 1863.