It is released from all pre-ganglionic sympathetic and parasympathetic neurons and from all post-ganglionic parasympathetic neurons.  
Neostigmine is used to treat myasthenia gravis because it inhibits the breakdown of this substance.  Curare is a competitive inhibitor of it for N1 nicotinic receptors, causing paralysis.  It is released from all pre-ganglionic sympathetic and parasympathetic neurons and from all post-ganglionic parasympathetic neurons.  Synthesized from two common biological molecules, one of which is bound to co-enzyme A, FTP, name this neurotransmitter.
Neostigmine is used to treat myasthenia gravis because it inhibits the breakdown of this substance.  
acetylcholine