Pulmonary branches of the vagus nerve

The pulmonary branches of the vagus nerve provide the primary parasympathetic innervation to the lungs, forming the pulmonary plexus at the root of each lung (StatPearls, 2023). These branches are responsible for regulating airway caliber through the release of acetylcholine, which induces bronchoconstriction and stimulates mucus secretion from submucosal glands via muscarinic M3 receptors (American Journal of Respiratory and Critical Care Medicine, 2018). In chronic respiratory diseases such as COPD and asthma, vagal hyper-responsiveness leads to persistent airway obstruction and exacerbations. Therapeutic interventions targeting these branches include long-acting muscarinic antagonists (LAMAs) like tiotropium, which block the effector receptors, and Targeted Lung Denervation (TLD), a bronchoscopic procedure that uses radiofrequency energy to ablate the nerves and permanently reduce cholinergic tone (Journal of Thoracic Disease, 2019). By modulating these neural pathways, clinicians can significantly improve lung function and quality of life for patients with obstructive lung diseases. Safety concerns include potential off-target effects on other vagal functions, such as gastrointestinal motility or heart rate regulation, as well as procedural risks associated with denervation.

Other names

Pulmonary vagus nerve branchesBronchial branches of the vagus nervePulmonary plexusVagal pulmonary branches

Inhibition of cholinergic signaling via muscarinic receptor antagonism (primarily M3) to prevent acetylcholine-induced bronchoconstriction, or physical disruption of nerve conduction through radiofrequency ablation (Targeted Lung Denervation) to permanently reduce parasympathetic tone (PubMed, 2021; Journal of Thoracic Disease, 2019).