Atlas of plant and animal histology

The image is from the spinal ganglia.

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Ganglia are groups of neurons that are part of the peripheral nervous system. Ganglia contain many ganglionar neurons, which are very large cells with really long cellular processes (axons and dendrites). There are also satellite cells, a type of glia, intermingled among ganglion neurons. Ganglia are covered by the capsule, a layer of connective tissue. There are sensory ganglia that send sensory information to the central nervous system and motor ganglia that send command information to the body muscles.