True regarding autonomic system is
Autonomic nervous system
-        The highest centre is the hypothalamus.
-        Conduction speed is slower in ANS compared to somatic nerves. ANS is non-myelinated. 
-        Preganglionic parasympathetic fibers are lengthier because parasympathetic ganglia lie closer to the organs.
-        Ratios of preganglionic to post ganglionic fibers are 1:20 to 1:100 in sympathetic system.
High centre of integration is medulla oblongata
Conduction autonomic fibres is same as in somatic motor fibres
Preganglionic parasympathetic fibres are more lengthy
Ratio of preganglionic and post ganglionic fibres is 20:1