Definition: a median, unpaired, ovoid cell group at the base of the midbrain tegmentum between the cerebral peduncles; it receives the retroflex fasciculus from the habenula and projects to the raphe region (raphe nuclei) and periaqueductal gray substance of the midbrain.
Synonym(s): nucleus interpeduncularisTA, ganglion isthmi, Gudden ganglion, intercrural ganglion, interpeduncular ganglion
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