News Health & Medicine How mice smell fear Mysterious structure at the tip of the nose could be a special alarm sensor. By Tina Hesman Saey August 21, 2008 at 1:09 pm - More than 2 years ago Share this:Share Share via email (Opens in new window) Email Click to share on Facebook (Opens in new window) Facebook Click to share on Reddit (Opens in new window) Reddit Click to share on X (Opens in new window) X Click to print (Opens in new window) Print Fear stinks. And its stench tickles a recently re-discovered set of nerves in the tip of a mouse’s nose. FEAR-OMONE | The Grueneberg ganglion, composed of about 500 neurons, is an alarm pheromone sensor.