The laryngeal cavity extends from the laryngeal entrance downwards to the lower border of the cricoid cartilage where it is continuous with that of the trachea

Vertebrate trachea

In tetrapod anatomy the trachea, or windpipe, is a tube that connects the pharynx or larynx to the lungs, allowing the passage of air. It is lined with pseudostratified ciliated columnar epithelium cells with goblet cells that produce mucus...

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It is divided into two parts by the projection of the vocal folds, between which is a narrow triangular fissure or chink, the rima glottidis

Rima glottidis

The rima glottidis is the opening between the true vocal cords and the arytenoid cartilages.It is normally subdivided into two parts, that between the arytenoid cartilages is called the intercartilaginous part , and that between the vocal folds the intermembranous part or glottis vocalis.It is...

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The portion of the cavity of the larynx

Larynx

The larynx , commonly called the voice box, is an organ in the neck of amphibians, reptiles and mammals involved in breathing, sound production, and protecting the trachea against food aspiration. It manipulates pitch and volume...

 above the vocal folds is called the vestibule; it is wide and triangular in shape, its base or anterior wall presenting, however, about its center the backward projection of the tubercle of the epiglottis.

It contains the ventricular folds, and between these and the vocal folds are the ventricles of the larynx.

The portion below the vocal folds is called the infraglottic cavity. It is at first of an elliptical form, but lower down it widens out, assumes a circular form, and is continuous with the tube of the trachea.

External links

• http://www.emory.edu/ANATOMY/AnatomyManual/pharynx.html