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This is a dorsal root ganglion (DRG) from a chicken embryo (around stage of day 7) after incubation overnight in NGF growth medium stained with anti-neurofilament antibody. You can see the axons growing out of the ganglion.
In anatomy, a ganglion is a tissue mass that contains the dendrites and cell bodies (or "somata") of nerve cells, in most case ones belonging to the peripheral nervous system. Within the central nervous system such a mass is often called a nucleus. An interconnected group of ganglia is called a plexus.
There are two major groups of ganglia: spinal ganglia and autonomic ganglia. The former contains the cell bodies of sensory nerves and the latter contains the cell bodies of autonomic nerves.
In the autonomic nervous system, fibers from the CNS to the ganglion are known as preganglionic fibers, while those from the ganglion to the effector organ are called postganglionic fibers.
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