Nasal mucosa and nasal mucus

The nasal mucosa is the specialized mucous membrane lining the nasal cavity, composed of a ciliated pseudostratified columnar epithelium, goblet cells, and a highly vascularized lamina propria (StatPearls: Anatomy, Head and Neck, Nasal Cavity, 2023). It serves as the primary physiological barrier and interface between the respiratory system and the external environment, facilitating air humidification, temperature regulation, and the filtration of inhaled particles. Nasal mucus, a complex secretion containing water, electrolytes, and mucin glycoproteins like MUC5AC and MUC5B, acts as a trap for pathogens and allergens, which are subsequently cleared via mucociliary transport (PubMed: Nasal mucus: a physical and chemical barrier, 2011). In pathological conditions such as allergic rhinitis or chronic sinusitis, the mucosa undergoes inflammatory changes and mucus production increases in volume or viscosity, leading to nasal obstruction and impaired clearance. While not a single molecular target, this tissue-secretion complex is the site of action for various pharmacological agents, including topical corticosteroids that suppress mucosal inflammation and decongestants that target adrenergic receptors to reduce vascular engorgement (Journal of Controlled Release: Nasal drug delivery, 2014). Chronic use of certain topical agents can lead to safety issues such as rhinitis medicamentosa, characterized by rebound mucosal swelling (StatPearls: Rhinitis Medicamentosa, 2023).

Other names

Schneiderian membraneNasal liningNasal secretionRespiratory mucosaNasal airway surface liquid

Drugs acting on this site typically function by inducing vasoconstriction of mucosal blood vessels (alpha-adrenergic agonists), reducing inflammatory cytokine production in mucosal cells (corticosteroids), or chemically disrupting disulfide bonds in mucin glycoproteins to reduce mucus viscosity (mucolytics).