Attachment of the tectorial membrane revealed by scanning electron microscope

Area of Science:

• Oto-neurology
• Cell Biology
• Scanning Electron Microscopy

Background:

• Sensorineural deafness causes are poorly understood.
• Tectorial membrane morphology is unclear, hindering interpretation of the organ of Corti.
• Existing descriptions vary due to technique-dependent alterations of the tectorial membrane's hydrated structure.

Purpose of the Study:

• To describe a novel technique for viewing the tectorial membrane.
• To elucidate the natural state and position of the tectorial membrane.
• To better understand the tectorial membrane's role in protecting the inner ear.

Main Methods:

• Viewing bulk frozen-hydrated tectorial membrane samples.
• Utilizing scanning electron microscopy for high-resolution imaging.
• Observing the tectorial membrane in its natural, hydrated state.

Main Results:

• The tectorial membrane is a gel-like structure, 90% water.
• Scanning microscopy reveals the tectorial membrane's natural state.
• The tectorial membrane seals to Hensen's cells in its living state, protecting the reticular lamina from endolymph.

Conclusions:

• The described technique provides new insights into tectorial membrane morphology.
• The tectorial membrane's natural state involves sealing to Hensen's cells.
• This sealing action is crucial for protecting the reticular lamina and may be relevant to hearing.