The ventricle of the larynx (also the laryngeal sinus or laryngeal ventricle) is a fusiform fossa

Fossa (anatomy)

In anatomical terminology, fossa has come to mean a depression or hollow, in general, in a bone. Other parts of the body may be involved, for example, the antecubital fossa...

, situated between the ventricular and vocal folds on either side, and extending nearly their entire length.

The fossa is bounded, above, by the free crescentic edge of the ventricular fold; below, by the straight margin of the vocal fold; laterally, by the mucous membrane

Mucous membrane

The mucous membranes are linings of mostly endodermal origin, covered in epithelium, which are involved in absorption and secretion. They line cavities that are exposed to the external environment and internal organs...

 covering the corresponding Thyreoarytænoideus.

The anterior part of the ventricle leads up by a narrow opening into a cecal pouch of mucous membrane

Mucous membrane

The mucous membranes are linings of mostly endodermal origin, covered in epithelium, which are involved in absorption and secretion. They line cavities that are exposed to the external environment and internal organs...

 of variable size called the appendix

Appendix of the laryngeal ventricle

The appendix of the laryngeal ventricle is a diverticulum which extends vertically from the ventricle of the larynx. It runs between the vestibular fold, thyroarytenoid muscle, and thyroid cartilage, and is conical, bending slightly backward. It is covered in roughly 70 mucous glands...

.

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