The ipsilateral cortical associative connections of different areas of primary somatic sensory (S1) and motor (M1) cortex were studied in 25 cats after local coagulation and infusion of horseradish peroxidase. It was shown, that the distribution of the associative fiber in M1 and S1 areas corresponded to the borders of somatotopic representation of different body parts. The fields within M1 (4y, 6ab) and S1 (1,2, 3a, 3b) with different morpho-functional organization were not connected by the system of association fibers crossing the cytoarchitectonic borders of the above mentioned areas. Primary somatosensory (S1) and motor (M1) cortex had no reciprocal connections. Single fibers connected neighboring areas of M1 and S1.
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