Summary

This textbook, published in 1889, presents Santiago Ramón y Cajal’s systematic method for preparing and examining nervous tissue under the microscope, establishing the histological techniques that underpinned his neuron doctrine. The book’s central thesis is that meticulous, standardized staining and sectioning protocols are essential for revealing the true structure of cells, particularly the intricate morphology of neurons, which Cajal argued were discrete units rather than a continuous network. It provides step-by-step instructions for fixation, embedding, sectioning, and staining, with a focus on the Golgi method and its modifications, which Cajal refined to visualize individual nerve cells in their entirety. A reader takes away a practical, hands-on understanding of late-19th-century micrographic techniques and the empirical foundation for Cajal’s revolutionary insights into neural architecture.

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Key concepts

Golgi method — A silver chromate staining technique that selectively impregnates a small percentage of neurons, revealing their entire cell body, dendrites, and axon.
Neuron doctrine — The principle, supported by Cajal’s histological work, that the nervous system is composed of individual, discrete cells (neurons) that communicate via specialized contacts.
Fixation — The process of preserving tissue structure by hardening it with chemicals like osmium tetroxide or formalin to prevent decay and enable thin sectioning.
Microtome — A precision instrument for cutting tissue into extremely thin slices (e.g., 10–50 micrometers) for microscopic examination.
Chromic acid — A fixative and mordant used in Cajal’s protocols to harden neural tissue and enhance the uptake of silver stains.