Ganglia are part of the peripheral nervous system. The peripheral nervous system includes all nerves outside the central nervous system (bundles of long nerve shoots with supporting cells) and small centers of nerve cells the ganglia.
A ganglion is a combination of mainly cell bodies (ganglion cells) with the nucleus of the nerve cell surrounded by cytoplasm without further shoots. This cell body with the nucleus as its center forms the metabolic center of the cell and is sensitive to stimuli. Ganglia function as switching stations for nerve impulses.
Sensory and autonomous ganglia are distinguished. Sensory ganglia receive stimuli from the environment and from the body itself that are transmitted to the central nervous system. They can be divided into cranial ganglia, which are connected to some brain nerves and spinal ganglia, which are connected to nerves of the dorsal roots of the spinal cord. The images shown here refer to the latter. They show that the large cell bodies are surrounded by small cells, the satellite cells, that provide protection.
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