Anatomy

Supraglottis—contains epiglottis, preepiglottic space, aryepiglottic folds, arytenoids, false cords, and half of the laryngeal ventricle (cavity between false and true cords). Has a good lymphatic supply

Glottis—contains lower half of laryngeal ventricle, true vocal cords, and extends 1 cm below the ventricle; has a poor lymphatic supply

Subglottis—area 1 cm below ventricle to inferior aspect of cricoid; has good lymphatic supply

Paraglottic space—area of cancer spread between supraglottic and glottic surface and the thyroid ala, pyriform sinus, and quadrangular membrane of the aryepi-glottic folds

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