The esophagus is not involved in the production of speech sounds. It is part of the digestive system and is responsible for carrying food and liquids from the throat to the stomach.
In contrast, the other options are involved in speech production:
Glottis – The space between the vocal cords, crucial for phonation.
Pharynx – Resonates and modifies sound as it travels from the vocal cords.
Trachea – The airway that directs airflow from the lungs to the larynx, essential for speech.