PREVERTEBRAL GANGLIA Meaning and
Definition
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Prevertebral ganglia are a group of nerve cell clusters located in front of the vertebral column, specifically in the abdominal and pelvic regions of the body. These ganglia form part of the autonomic nervous system, which controls involuntary bodily functions such as digestion, blood pressure regulation, and reproductive processes.
The prevertebral ganglia receive input from preganglionic fibers, which are nerve fibers that originate from the spinal cord. These preganglionic fibers synapse with the postganglionic fibers within the prevertebral ganglia. The postganglionic fibers then carry the nerve signals to various organs and tissues in the abdomen and pelvis.
The prevertebral ganglia are responsible for regulating the activity of organs related to the sympathetic division of the autonomic nervous system. This division is involved in the "fight or flight" response, which prepares the body for action during times of stress or danger. The ganglia play a crucial role in coordinating the release of neurotransmitters that either stimulate or inhibit the target organs, depending on the specific needs of the body at a given time.
Some examples of prevertebral ganglia include the celiac ganglia, which innervate the stomach, liver, spleen, and other abdominal organs, as well as the superior and inferior mesenteric ganglia, which supply the intestines, kidneys, and urinary bladder. Overall, prevertebral ganglia are an integral part of the autonomic nervous system, contributing to the regulation of vital bodily functions.
Etymology of PREVERTEBRAL GANGLIA
The term "prevertebral ganglia" is derived from two components: "prevertebral" and "ganglia".
"Prevertebral" comes from the Latin prefix "pre-" meaning "before" or "in front of", and "vertebra" referring to the bones of the spinal column. Thus, "prevertebral" suggests a position or location that is situated in front of the vertebrae.
"Ganglia" is the plural form of "ganglion", a term derived from the Greek word "ganglion" meaning "knot" or "swelling". In anatomy, ganglia refers to a cluster of nerve cell bodies located outside of the central nervous system.
Therefore, when combined, "prevertebral ganglia" refers to the collections of nerve cell bodies located in front of or anterior to the vertebral column.
