It is the anterior enlarged part of the wind pipe, made of cartilage i.e. thyroid, cricoids. Arytenoids, etc. the enlarged thyroid cartilage is called Adam’s apple. A cartilaginous muscular flap, the epiglottis is attached to the top of the thyroid cartilage. It can close the glottis while swallowing food. Vocal cords are stretched between thyroid and arytenoids cartilages. Vibrations of vocal cords produce sound. Rima glottidis is the opening between the cords.