The Papez circuit, implicated in emotional memory, consists of which sequence of structures?

• A Hippocampus → fornix → mammillary bodies → anterior thalamus → cingulate cortex → entorhinal cortex → hippocampus ✓
• B Amygdala → stria terminalis → hypothalamus → septal nuclei → hippocampus → amygdala
• C Hippocampus → fornix → septal nuclei → anterior thalamus → prefrontal cortex → hippocampus
• D Cingulate cortex → corpus callosum → thalamus → basal ganglia → prefrontal cortex → cingulate

Explanation

The Papez circuit, described in 1937, is the principal circuit for emotional processing and episodic memory consolidation: hippocampus → fornix → mammillary bodies → mammillothalamic tract → anterior thalamic nucleus → cingulate cortex → entorhinal cortex (via cingulum) → hippocampus. Bilateral mammillary body damage (as in Wernicke–Korsakoff syndrome) disrupts this circuit and causes anterograde amnesia with confabulation. The amygdala pathway via stria terminalis is a separate but related circuit for conditioned fear.

Reference: Guyton & Hall, Textbook of Medical Physiology, 14th ed.

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