A ganglion is a group of neuron cell bodies in the peripheral nervous system.
In the somatic nervous system this includes dorsal root ganglia and trigeminal ganglia among a few others.
In the autonomic nervous system there are both sympathetic and parasympathetic ganglia which contain the cell bodies of postganglionic sympathetic and parasympathetic neurons respectively.

A pseudoganglion looks like a ganglion, but only has nerve fibers and has no nerve cell bodies.
A ganglion is a group of neuron cell bodies in the peripheral nervous system. In the somatic nervous system this includes dorsal root ganglia and trigeminal ganglia among a few others. In the autonomic nervous system there are both sympathetic and parasympathetic ganglia which contain the cell bodies of postganglionic sympathetic and parasympathetic neurons respectively.
A pseudoganglion looks like a ganglion, but only has nerve fibers and has no nerve cell bodies.
Ganglion