Annular ligaments of trachea - AbsoluteAstronomy.com

The Annular ligaments of the trachea are circular horizontal fibrous bands that join the tracheal rings

Tracheal rings

The cartilages of the trachea vary from sixteen to twenty in number. Each forms a semicircular ring of hyaline cartilage, which occupies the anterior two-thirds or so of the circumference of the trachea...

together.

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