Paper, 'Some points in the histology of the nervous system of the embryonic lobster' by Edgar Johnson Allen

Description

Allen writes: 'The following observations have been made on late embryos of the common lobster (Homarus vulgaris) by means of Ehrlich’s methylene blue method, as modified by Biedermann and Apáthy. The results to be recorded in the present communication apply chiefly to the thoracic ganglia, which in the embryo are fused into one mass. The nerve elements, which have stained, may be divided into three main groups:— I. Elements of which both the cell and the fibre lie entirely in the ganglionic chain, and which must be supposed to serve the purpose of co-ordinating the action of its various parts. II. Elements which consist of a ganglion cell in the cord and a fibre which runs out at a lateral nerve root. Some, at least, of these elements, possibly all, are connected with muscles, and are motor elements. III. Elements which consist of a cell lying outside the central ganglionic chain, and a fibre running from it to a ganglion. These must be regarded as sensory elements.'

Annotations in pencil and ink. Includes one diagram of the nervous system of the embryonic lobster.

Subject: Neuroscience / Anatomy

Received 10 February 1894 / 20 April 1894. Read 26 April 1894. Communicated by Walter Raphael Weldon.

A version of this paper was published in volume 55 of the Proceedings of the Royal Society as 'Some points in the histology of the nervous system of the embryonic lobster'.

Reference number

PP/23/27

Earliest possible date

1894

Physical description

Ink and graphite pencil on paper

Page extent

18 pages

Format

Manuscript
Diagram