three drawings by Santiago Ramon y Cajal, taken from the book "Comparative study of the sensory areas of the human cortex", pages 314, 361, and 363.  Left:  Nissl-stained visual cortex of a human adult.  Middle: Nissl-stained motor cortex of a human adult.  Right: Golgi-stained cortex of a 1 1/2 month old infant.
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			<div class="thumb" style="width: 150px;"><div style="margin:15px auto;"><a href="//commons.wikimedia.org/wiki/File:Visual_cortex_-_low_mag.jpg" class="image" title="Micrograph of the visual cortex."><img alt="Micrograph of the visual cortex." src="https://upload.wikimedia.org/wikipedia/commons/thumb/4/47/Visual_cortex_-_low_mag.jpg/80px-Visual_cortex_-_low_mag.jpg" decoding="async" width="80" height="120" srcset="https://upload.wikimedia.org/wikipedia/commons/thumb/4/47/Visual_cortex_-_low_mag.jpg/120px-Visual_cortex_-_low_mag.jpg 1.5x, https://upload.wikimedia.org/wikipedia/commons/thumb/4/47/Visual_cortex_-_low_mag.jpg/160px-Visual_cortex_-_low_mag.jpg 2x" data-file-width="2848" data-file-height="4272"></a></div></div>
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<p><a href="https://en.wikipedia.org/wiki/micrograph" class="extiw" title="w:micrograph">Micrograph</a> of the visual cortex.
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User:Looie496 created file, Santiago Ramon y Cajal created artwork
"Comparative study of the sensory areas of the human cortex" by Santiago Ramon y Cajal, published 1899, <a href="//commons.wikimedia.org/wiki/Special:BookSources/9781458821898" title="Special:BookSources/9781458821898">ISBN 9781458821898</a>