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Mucosa of Trachea
Respiratory System

Mucosa of Trachea

Tunica mucosa tracheae

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Structure

The tracheal mucosa is the innermost layer of the tracheal wall that lines the tracheal lumen. The mucosa is thrown into folds along the posterior wall where hyaline cartilage is absent Surrounding the tracheal mucosa is the submucosa, which consists of dense connective tissue and seromucous glands. Tracheal cartilage and the trachealis muscle surround the outer surface of the submucosal layer.

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Key Features/Anatomical Relations

The tracheal mucosa is composed of ciliated pseudostratified columnar epithelium with Goblet cells. The mucus produced by the Goblet cells serves to trap foreign airborne particles in the inspired air. Additionally, the upward beating motion of the cilia of the epithelium move this mucus superiorly, after which the mucus is either expelled as phlegm or swallowed and destroyed by stomach acids.

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Trachea Mucosa

ScienceDirect image

Large rents in the tracheal mucosa with extensive herniation of soft tissue into the tracheal lumen can be sutured as described by Fubini et al (1985), who dissected the trachea free at the injury site and rotated it to allow suture repair of a progressively enlarging intratracheal hernia of the dorsal aspect of the trachea that contained trachealis muscle and subcutaneous tissue.

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