Sympathetic trunk

Sympathetic trunk (also known as sympathetic chain, vertebral nerve, or gangliated cord) is a part of the autonomic nervous system that runs along both sides of the vertebral column. It is one of the key components of the sympathetic nervous system, which is responsible for the body's 'fight or flight' response.

Etymology

The term "sympathetic" comes from the Greek word "sympatheia", which means "fellow feeling" or "compassion". The term "trunk" is derived from the Latin word "truncus", which means "main part" or "core".

Structure

The sympathetic trunk is a paired structure, with each trunk running longitudinally along the anterolateral surface of the vertebral bodies. The trunks are most prominent in the thoracic region, where they lie on either side of the vertebral bodies. Each trunk is formed by a series of ganglia that are interconnected by interganglionic segments.

Function

The primary function of the sympathetic trunk is to distribute nerve fibers to the visceral plexuses. It does this by giving off branches that communicate with the spinal nerves. These branches, known as rami communicantes, carry both visceral efferent (motor) and visceral afferent (sensory) fibers.

Clinical significance

Due to its role in the autonomic nervous system, the sympathetic trunk is involved in many physiological processes, including the regulation of heart rate, blood pressure, and body temperature. Dysfunction of the sympathetic trunk can lead to a variety of clinical conditions, such as Horner's syndrome, Raynaud's disease, and hyperhidrosis.

See also

• Autonomic nervous system
• Sympathetic ganglion
• Rami communicantes

References

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