Retinogeniculate terminations in cats: morphological differences between X and Y cell axons

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Science  22 Oct 1982:
Vol. 218, Issue 4570, pp. 389-391
DOI: 10.1126/science.7123239


We injected horseradish peroxidase into single, physiologically identified, optic tract axons of X and Y cells in cats and studied their termination patterns in the lateral geniculate nucleus. All X cell axons innervate lamina A or A1 in narrow zones, and some sparsely innervate the medical interlaminar nucleus. All Y cell axons have broad terminal zones in laminae A and C (from the contralateral retina) or lamina A1 (if ipsilateral), and most innervate the medial interlaminar nucleus densely.