The Imprints of the Human Tectorial Membrane

Abstract

The human tectorial membrane was observed with the scanning electron microscope. Imprints were observed on the undersurface of the middle zone of the tectorial membrane in a configuration corresponding to the arrangement of hairs on the outer sensory cells, indicating the insertion of the sensory hair tips. the imprints were arranged not only in a single line forming a W shape (single imprint), but also in 2 or 3 lines (multiple imprint) in the human. Oblique SEM observation of the imprints showed that there was a slight elevation of the basal layer of the tectorial membrane bearing the imprints (W-shaped elevated zone). Furthermore, a deep hollow surrounded the imprints. the findings are discussed from a functional viewpoint.