“Whether as a result of heat, hunger, standing for too long or merely the sight of blood or needles, 40% of people faint at least once in their lives.
But exactly what causes these brief losses of consciousness — which researchers call syncope — has been a mystery..
Now, researchers have discovered a neural pathway that controls the process, involving a group of sensory neurons that connect the heart to the brainstem”
CNMRI: Neurology, Sleep Medicine, MRI 