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Cerebral Cortex 1992; 2:217-230
© Oxford University Press 1992

research-article

The Spatial Distribution of Pulvinar Neurons That Project to Two Subregions of the Inferior Parietal Lobule in the Macaque

S. G. Patrick Hardy1,2 and James C. Lynch1,3

1Departments of Anatomy, The University of Mississippi Medical Center Jackson, Mississippi 39216, 2Departments of Physical Therapy, The University of Mississippi Medical Center Jackson, Mississippi 39216, 3Departments of Ophthalmology, The University of Mississippi Medical Center Jackson, Mississippi 39216

The distribution of pulvinar neurons that project to the lateral intrapariatal area (LIP) and area 7a, two subregions of the inferior parietal lobule in monkeys, was determined using small injections of retrogradely transported fluorescent dyes. Both LIP and 7a received the majority of their thalamic input from contiguous but distinct zones within the medial pulvinar nucleus. Thalamocortical cell bodies that projected to LIP were arranged in a dense, horizontally oriented cluster that was sandwiched between two similar clusters of neurons that projected to 7a. There was minimal overlap of the respective clusters. LIP also received an appreciable input from the dorsal half of the lateral pulvinar nucleus, but tracer placements in 7a resulted in only occasional labeled neurons in the lateral pulvinar.


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