Single neurons were recorded in the striate visual cortex (area 17) of the old-world monkey Macacus namestrinus. Eight pyramidal neurons, seven spiny stellate neu rons, two basket cells, a clutch cell, and a chandelier cell were filled intracellulary with HRP. Their receptive fields were consistent with previous single-unit studies. Their axonal arbors were less elaborate than in equivalent neurons in the cat, but the laminar specificity of the houtons was very much more precise in the monkey than in the cat. Nevertheless, the basic cortical circuits in cat and monkey appear to hevery similar.

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