Collection Of Nerve Cell Bodies

10.4A: Clusters of Neuronal Jail cell Bodies

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Clusters of prison cell bodies in the fundamental nervous system are called nuclei, while the cell bodies lining the fretfulness in the peripheral nervous system are called ganglia.

Learning Objectives

Identify the types of clusters of neuronal jail cell bodies

Key Points

A cluster of neurons is called a nucleus if found in the cardinal nervous system; it is chosen a ganglion if found in the peripheral nervous system (PNS).
Ganglia are the intermediate structures between the central and peripheral nervous systems.
Satellite glial cells (SGC) line the exterior surface of neurons in the PNS and environment neuron jail cell bodies within ganglia.

Key Terms

ganglion: A cluster of interconnecting nervus cells outside the brain.
nucleus: A cluster of neuronal bodies where synapsing occurs.

In neuroanatomy, a nucleus is a brain structure consisting of a relatively meaty cluster of neurons. It is i of the two nearly common forms of nerve cell organization along with layered structures such as the cerebral cortex or cerebellar cortex. In anatomical sections, a nucleus shows up as a region of grayness matter oft bordered by white matter. The vertebrate brain contains hundreds of distinguishable nuclei varying widely in shape and size. A nucleus may itself have a complex internal construction, with multiple types of neurons arranged in clumps (subnuclei) or layers.

In addition, the term nucleus can refer to a distinct grouping of neurons that spread over an extended area. For example, the reticular nucleus of the thalamus is a sparse layer of inhibitory neurons that environs the thalamus.

In the peripheral nervous system, a cluster of neurons is called a ganglion. One exception is the basal ganglia, located non in the periphery only rather in the forebrain. Ganglia are composed mainly of neuron jail cell bodies (somata) and dendritic structures. They are the intermediary connections between the peripheral and primal nervous systems.

Innervation of the Autonomic Nervous System: Satellite glial cells are expressed throughout the sympathetic and parasympathetic ganglia in their respective nervous system divisions.

Satellite glial cells line the exterior surface of neurons in the PNS. Satellite glial cells (SGCs) also surroundings neuron cell bodies within ganglia. They are of a like embryological origin to Schwann cells of the PNS, as both are derived from the neural crest of the embryo during development. SGCs take a diverseness of roles, including control over the microenvironment of sympathetic ganglia. They are thought to have a similar office to astrocytes in the fundamental nervous organisation (CNS). They supply nutrients to the surrounding neurons and besides have some structural office. Satellite cells likewise act as protective, cushioning cells. Additionally, they express a variety of receptors that permit for a range of interactions with neuroactive chemicals.