Between any two peduncles.
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in·ter·pe·dun·cu·lar .int-ər-pi-'dəŋ-kyə-lər adj lying between the peduncles of the brain
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adj.
situated between the peduncles of the cerebrum or cerebellum.
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in·ter·pe·dun·cu·lar (in″tər-pə-dunkґu-lər) [inter- + peduncular] situated between two peduncles, as between two cerebellar peduncles.Medical dictionary. 2011.