Definition: the short, often slitlike passage that, on both the left and right side, connects the third brain ventricle (of the diencephalon) with the lateral ventricles (of the cerebral hemispheres); the passage is bounded anteriomedially by the column of fornix and posterolaterally by the anterior pole and anterior tubercle of the dorsal thalamus.
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Examples: glitazone, GI cocktail, etc.