What is pertaining to within the trachea?

The trachea is a tube-like structure that connects the larynx (voice box) to the lungs. It is also known as the windpipe. The trachea is lined with ciliated epithelium, which helps to move mucus and foreign particles out of the lungs. The trachea also contains cartilage rings, which help to keep it open.

Within the trachea, there are a number of important structures, including:

* The vocal cords: The vocal cords are two folds of tissue that vibrate when air passes through them, creating sound.

* The epiglottis: The epiglottis is a flap of tissue that covers the trachea during swallowing,防止食物进入肺部.

* The carina: The carina is a ridge of tissue that divides the trachea into two bronchi, which lead to the lungs.

The trachea is an important part of the respiratory system, and it plays a vital role in breathing.