
Trachea
The trachealis muscle is smooth muscle that spans the opening between the ends of each cartilage ring, controlling the diameter of the trachea. Frequently, mixed glands accumulate over this muscle. 40x

Lumen
The trachealis muscle is smooth muscle that spans the opening between the ends of each cartilage ring, controlling the diameter of the trachea. Frequently, mixed glands accumulate over this muscle. 40x

Cartilage ring
The trachealis muscle is smooth muscle that spans the opening between the ends of each cartilage ring, controlling the diameter of the trachea. Frequently, mixed glands accumulate over this muscle. 40x

Trachealis muscle
The trachealis muscle is smooth muscle that spans the opening between the ends of each cartilage ring, controlling the diameter of the trachea. Frequently, mixed glands accumulate over this muscle. 40x

Mixed glands
The trachealis muscle is smooth muscle that spans the opening between the ends of each cartilage ring, controlling the diameter of the trachea. Frequently, mixed glands accumulate over this muscle. 40x