Cupula

A cupula is a small, inverted cup or dome-shaped cap over a structure, including:
 * Ampullary cupula, a structure in the vestibular system, providing the sense of spatial orientation
 * Cochlear cupula, a structure in the cochlea
 * Cupula of the pleura, related to the lungs
 * The cervical parietal pleura in the thorax
 * A layer in the otolith organs
 * The cupula optica, or optic cup, in embryological development of the eye
 * Cup-like structure fitted over the eye during electrophysiology study
 * Suprapleural membrane