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sympathetic trunk
The sympathetic trunk is a paired longitudinal collection of sympathetic ganglia and fibers that runs alongside the vertebral column. It forms a principal component of the sympathetic nervous system and connects with spinal nerves, visceral nerves, and autonomic plexuses supplying thoracic, abdominal, and pelvic structures. Clinical and surgical interest spans neurology, cardiology, thoracic surgery, and pain management.
The sympathetic trunk extends from the base of the skull near the jugular foramen and foramen magnum through the neck alongside the internal carotid artery and common carotid artery, descending into the thorax adjacent to the stellate ganglion and along the vertebral column posterior to the parietal pleura. In the thoracic region it gives off cardiac and pulmonary branches that contribute to the cardiac plexus and pulmonary plexus, then continues into the abdomen contributing to the celiac plexus and superior mesenteric plexus near the diaphragm and celiac trunk. Distally it forms the inferior hypogastric plexus in the pelvis, communicating with pelvic splanchnic nerves and arriving near the sacral promontory and pelvic floor. Each trunk comprises paravertebral ganglia interconnected by preganglionic and postganglionic fibers; these ganglia are patterned in relation to vertebral levels such as the cervical vertebrae, thoracic vertebrae, lumbar vertebrae, and sacrum. White rami communicantes convey myelinated preganglionic fibers from spinal nerves at thoracolumbar levels, while gray rami communicantes return unmyelinated postganglionic fibers to spinal nerves for distribution to peripheral structures including sweat glands innervated in regions served by the brachial plexus and lumbosacral plexus.
Embryologically, components of the sympathetic trunk originate from neural crest cells that migrate ventrolaterally adjacent to the developing somites and differentiate under the influence of transcription factors and signaling pathways active in structures such as the neural tube, somite derivatives, and adjacent mesenchyme. Migration and aggregation of neural crest cells are coordinated with vascular development including branches of the aortic arch and the dorsal aorta, and with morphogen gradients influenced by molecules implicated in patterning across embryos studied by researchers at institutions like Max Planck Society and Cold Spring Harbor Laboratory. Congenital anomalies involving neural crest derivatives can manifest in disorders associated with the trunk or nearby structures, a subject investigated in models from labs affiliated with Harvard Medical School and Salk Institute.
The trunk mediates sympathetic outflow that modulates cardiovascular, respiratory, sudomotor, pupillary, and visceral functions. Preganglionic neurons originating in the intermediolateral cell columns of spinal segments such as those described historically in work from Guy's Hospital and Johns Hopkins Hospital project to paravertebral ganglia where synapses produce postganglionic fibers that ascend or descend to targets including the heart, lungs, eye, and abdominal viscera like the stomach and intestine. Sympathetic fibers contribute to vasomotor tone influencing blood pressure regulation pathways studied by researchers at Mayo Clinic and Cleveland Clinic, and they interact with parasympathetic inputs within plexuses such as the enteric nervous system circuits characterized by investigators from University College London and Stanford University. Reflex arcs involving the trunk coordinate responses to stressors documented in early physiological literature from University of Cambridge and in modern autonomic testing at Massachusetts General Hospital.
Disorders of the trunk contribute to a spectrum of conditions including neuropathic pain, complex regional pain syndrome, hyperhidrosis, and autonomic dysregulation syndromes encountered in clinics at University of Pennsylvania, Mount Sinai Hospital, and Karolinska Institutet. Lesions may arise from trauma, compressive tumors such as neurofibromas studied in cohorts at Memorial Sloan Kettering Cancer Center, or iatrogenic injury during operations performed at centers like Cleveland Clinic Foundation. Surgical or chemical sympathectomy is a treatment for hyperhidrosis and refractory vasospasm with procedures refined at institutions including Mayo Clinic and Guy's and St Thomas' NHS Foundation Trust. Dysautonomias involving the trunk appear in systemic diseases such as diabetes mellitus, neurodegenerative disorders exemplified by Parkinson's disease, and paraneoplastic syndromes researched at Johns Hopkins University School of Medicine.
Preoperative imaging relies on modalities provided by vendors and departments at Massachusetts General Hospital, Mayo Clinic, and Royal Marsden Hospital using computed tomography, magnetic resonance imaging, and ultrasound to delineate paravertebral anatomy and adjacent structures like the pleura, esophagus, and thoracic aorta. Thoracoscopic and endoscopic approaches to sympathectomy intersect with techniques developed at Cleveland Clinic and The Ohio State University Wexner Medical Center, while anesthetic and pain management protocols are influenced by standards from American Society of Anesthesiologists and European Society of Anaesthesiology. Image-guided interventions such as fluoroscopy- or ultrasound-guided stellate ganglion block employ equipment and protocols influenced by research from Stanford University School of Medicine and Duke University Medical Center. Surgical planning must consider relationships to vertebral landmarks like the transverse process, vascular structures including the internal thoracic artery, and potential complications reported in registries at Royal College of Surgeons and multicenter studies coordinated by World Federation of Neurosurgical Societies.
Category:Autonomic nervous system