Ketamine Relieves Depression By Restoring Brain Connections : Shots - Health Blog : NPR

" A healthy neuron looks like a tree in spring, he says, with lots of branches and leaves extending toward synaptic connections with other neurons. "What happens in depression is there's a shriveling of these branches and these leaves and It looks like a tree in winter. And a drug like ketamine does make the tree look like one back in spring." "

http://www.npr.org/blogs/health/2012/10/04/162299564/ketamine-relieves-depression-by-restoring-brain-connections