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There's mention of the mammillary bodies in the sleep apnea article:
In the June 27, 2008, edition of the journal Neuroscience Letters, researchers revealed that people with OSA (obstructive sleep apnea) show tissue loss in brain regions that help store memory, thus linking OSA with memory loss. Using magnetic resonance imaging (MRI), the scientists discovered that sleep apnea patients' mammillary bodies were nearly 20 percent smaller, particularly on the left side. One of the key investigators hypothesized that repeated drops in oxygen lead to the brain injury.22.214.171.124 (talk) 00:43, 11 September 2010 (UTC)