Ganglion

Ganglia are primarily made up of somata and dendritic structures, which are bundled or connected. Ganglia often interconnect with other ganglia to form a complex system of ganglia known as a plexus. Ganglia provide relay points and intermediary connections between different neurological structures in the body, such as the peripheral and central nervous systems.

Among vertebrates there are three major groups of ganglia:

• Dorsal root ganglia (also known as the spinal ganglia) contain the cell bodies of sensory (afferent) neurons.
• Cranial nerve ganglia contain the cell bodies of cranial nerve neurons.
• Autonomic ganglia contain the cell bodies of autonomic nerves.

In the autonomic nervous system, fibers from the central nervous system to the ganglia are known as preganglionic fibers, while those from the ganglia to the effector organ are called postganglionic fibers.

The term "ganglion" refers to the peripheral nervous system.^[1]

However, in the brain (part of the central nervous system), the basal ganglia is a group of nuclei interconnected with the cerebral cortex, thalamus, and brainstem, associated with a variety of functions: motor control, cognition, emotions, and learning.^{[citation needed]}

Partly due to this ambiguity, the Terminologia Anatomica recommends using the term 'basal nuclei' instead of 'basal ganglia'; however, this usage has not been generally adopted.^{[citation needed]}

A pseudoganglion is a localized thickening of the main part or trunk of a nerve that has the appearance of a ganglion^[2] but has only nerve fibers and no nerve cell bodies.

Pseudoganglia are found in the teres minor muscle^[3] and radial nerve.^{[citation needed]}

• Sympathetic ganglion
• Ganglion cyst
• Nervous system
• Neuron
• Chiasm

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