List the anatomical structures of the human upper respiratory tract.

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Understand that the human upper respiratory tract includes all the anatomical structures involved in the passage of air from the external environment to the lower respiratory tract, primarily located above the vocal cords.

Identify the main external entry point: the nasal cavity, which filters, warms, and moistens the air inhaled through the nose.

Include the paranasal sinuses, which are air-filled spaces around the nasal cavity that help lighten the skull and produce mucus.

Recognize the pharynx, a muscular tube divided into three parts: nasopharynx (behind the nasal cavity), oropharynx (behind the oral cavity), and laryngopharynx (leading to the larynx).

Note the larynx (voice box) as the lower boundary of the upper respiratory tract, which connects the pharynx to the trachea and contains the vocal cords.

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Anatomy of the Nasal Cavity

The nasal cavity is the initial part of the upper respiratory tract, responsible for filtering, warming, and humidifying inhaled air. It includes structures such as the nostrils, nasal septum, and turbinates (conchae) that increase surface area for air processing.

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Pharynx Structure and Function

The pharynx is a muscular tube connecting the nasal cavity to the larynx and esophagus. It is divided into three regions: nasopharynx, oropharynx, and laryngopharynx, serving as a passageway for both air and food.

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Functional Groups

Role of the Larynx in the Upper Respiratory Tract

The larynx, or voice box, is located below the pharynx and above the trachea. It functions in protecting the lower respiratory tract during swallowing and houses the vocal cords, playing a key role in sound production.

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