Washington, March 9 (ANI): Researchers have discovered that the hair cells of the inner ear have a previously unknown "root" extension that may allow them to communicate with nerve cells and the brain to regulate sensitivity to sound vibrations and head position. The hair-like structures, called stereocilia, are fairly rigid and are interlinked at their tops by structures called tip-links. When you move your head, or when a sound vibration enters your ear, motion of fluid in the ear causes the tip-links to get displaced and stretched, opening up ion channels and exciting the cell, which can then relay information to the brain, said Anna Lysakowski, professor of anatomy and cell biology at the UIC College of Medicine and principal investigator on the study. The stereocilia are rooted in a gel-like cuticle on the top of the cell that is believed to act as a rigid platform, helping the hairs return to their resting position. Lysakowski and her colleagues were interested in a part of the cell called the striated organelle, which lies underneath this cuticle plate and is believed to be responsible for its stability. Using a high-voltage electron microscope at the National Center for Microscopy and Imaging Research … Continue reading
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