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Quarterly Journal of Microscopical Science, Vol s3-88, 445-462, Copyright © 1947 by Company of Biologists

The Cytology of the Neurones of Helix Aspersa

OWEN LEWIS THOMAS M.D. (N.Z.)1

1 Beit Memorial Medical Research Fellow; Department of Zoology and Comparative Anatomy, Oxford

1. Direct observation of the living nerve-cells of Helix aspersa reveals the presence of two categories of cellular organoids:

(a) Spheroid complexes consisting of a central core of chromophobe material covered wholly or in part by a chromophil lipine substance.

(b) Filaments and coccoid chains, and dispersed coccoid particles.

2. Evidence is put forward identifying the spheroid complexes as a dispersed type of Golgi apparatus and the filaments and coccoids as the mitochondria.

3. The chromophobe core of the spheroids is identified as the vacuome of Parat and is the site for the formation of an endosomal Golgi product (the lipochrome granules of earlier workers).

4. The so-called Golgi dictyosome and archoplasm cannot be observed in living cells and are probably an artifact of technique produced by an over-impregnation of the mitochondria with silver or osmium.






© The Company of Biologists Ltd 1947