The cartilaginous rings are C-shaped to allow the trachea to collapse slightly at the opening so that food can pass down the esophagus.

Is the trachea C-shaped?

A normal trachea (windpipe) has many rings made of cartilage (a strong and flexible tissue). These rings are C-shaped and support the trachea but also allow it to move and flex when your child breathes. ... The number of rings in the trachea varies from 16 to 20.

Why are the tracheal cartilages C-shaped instead of O shaped?

The hyaline cartilage rings of the trachea are C-shaped rather than O-shaped because of the trachea's close proximity to the esophagus, which runs...