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tectorial membrane
This term is a highly specialized anatomical designation used almost exclusively in otology and auditory neuroscience. It describes a specific biological structure rather than a general material, meaning it is used in a technical, descriptive register to explain the mechanics of hearing.
Because it refers to a unique, singular anatomical structure within the cochlea, it is treated as a countable noun in a biological sense (e.g., the tectorial membranes of both ears), though it is most frequently encountered in the singular when discussing the general mechanism of sound transduction.
Meanings
An acellular, gelatinous extracellular matrix that overlays the sensory hair cells within the cochlea of the inner ear, playing a critical role in the transduction of sound waves into electrical signals by providing a mechanical resistance against which the stereocilia of the hair cells are deflected.