Cochlea, Coil Section, Sem

by Oliver Meckes EYE OF SCIENCE

Title

Cochlea, Coil Section, Sem

Artist

Oliver Meckes EYE OF SCIENCE

Medium

Photograph - Photograph

Description

This image shows a part of the cochlea's coil, with the stereovilli of the organ of Corti. The three rows of the outer hair cells (OHC with Stereocilia or Stereovilli, red/white) are clearly visible as the tectorial membrane, which usually is connected with the tips of the stereocilia has lifted up during preparation. Some of the inner hair cells (IHC) still have contact to the tectorial membrane. On top to right, one can see the Reissner membrane (bright beige). The outermost area, left are the Hensen cells, here colored brownish. The ear of all mammals consists of the auricle with the external ear canal, the middle ear behind the eardrum with the ossicles which are connected to the "oval window" and make the transition to the fluid-filled inner ear with the cochlea and organ of balance. The organ of Corti lies in the entire length of the cochlea. Close to the oval window the hair cells of the organ of Corti are sensitive to high tones, while towards the tip of the cochlea they are sensitive to lower and lower tones. The tectorial membrane is connected to the tips of the hair cells’ stereovilli, which causes these stereovilli to shift and stretch when there is sound pressure. These distractions are converted into electrical impulses that are sent to the brain. Scanning electron micrograph, magnification 350x (at 15 cm image width).

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May 19th, 2021

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