Vagal sensory nerve fiber (cough receptor)

Sensory nerve endings mediating the cough reflex comprise vagal afferent fibers distributed throughout the airway mucosa. These nerve endings are classified into three main groups based on morphology, conduction velocity, and function: Rapidly Adapting Receptors (RARs), Slowly Adapting Stretch Receptors (SARs), and C-Fibers[1][5]. RARs (also referred to as irritant receptors or cough receptors) are predominant in the posterior wall of the trachea, larynx, and at the tracheal carina, responding primarily to mechanical and chemical irritants[1][2][5]. C-Fibers respond to environmental chemicals, inflammatory mediators, and tissue damage[3]. SARs are mainly mechanoreceptors responsive to lung inflation[1][5]. These fibers connect via the vagus nerve to central cough centers in the brainstem, forming the foundation of the cough reflex arc. The neural mechanisms involve both Aδ-fibers (thin, myelinated) and unmyelinated C-fibers arising from nodose and jugular ganglia, respectively[3][4]. These nerve endings are critical for the detection of irritants, particulates, and inflammation in the airways and mediate the cough reflex through integration at brainstem centers[1][3][4][5]. Vagal sensory nerve fibers, especially "cough receptors" (such as RARs and C-fibers), are considered valid drug targets for antitussive therapies[3][4]. The submitted name is *descriptive* and should be precisely mapped to "Vagal sensory nerve fiber (cough receptor)" or its molecular subtypes (RAR, C-fiber) for structured data.

Other names

Rapidly adapting receptor (RAR)C-fiber (unmyelinated sensory fiber)Slowly adapting stretch receptor (SAR)Airway nociceptorCough receptorAirway sensory neuron

Inhibition of ion channel activation (TRPV1, TRPA1 antagonists reduce sensory fiber excitability) Suppression of neurotransmitter release Neural desensitization Central modulation of cough processing