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Some claustro‐cortical connections in the cat and baboon as studied by retrograde horseradish persocidase transport

1. The mammalian Claustrun (Cl) is a convergent multisensory structure of unknown function, and disputed ontogenetic origin. Its cortical projections, hitherto unknown, have been studied in cat and baboon by means of the horseradish peroxidase (HRP) technique. HRP was injected into the gyrus proreus (frontal eye field) of cats, and separately into the frontal eye fields, visual areas, and motor‐premotor areas of the baboon cortex.