Computational models of hair cell bundle mechanics: III. 3-D utricular bundles.

Abstract:

:Six utricular hair bundles from a red-eared turtle are modeled using 3-D finite element analysis. The mechanical model includes shear deformable stereocilia, realignment of all forces during force load increments, and tip and lateral link inter-stereocilia connections. Results show that there are two distinct bundle types that can be separated by mechanical bundle stiffness. The more compliant group has fewer total stereocilia and short stereocilia relative to kinocilium height; these cells are located in the medial and lateral extrastriola. The stiff group are located in the striola. They have more stereocilia and long stereocilia relative to kinocilia heights. Tip link tensions show parallel behavior in peripheral columns of the bundle and serial behavior in central columns when the tip link modulus is near or above that of collagen (1x10(9) N/m(2)). This analysis shows that lumped parameter models of single stereocilia columns can show some aspects of bundle mechanics; however, a distributed, 3-D model is needed to explore overall bundle behavior.

journal_name

Hear Res

journal_title

Hearing research

authors

Silber J,Cotton J,Nam JH,Peterson EH,Grant W

doi

10.1016/j.heares.2004.06.006

keywords:

subject

Has Abstract

pub_date

2004-11-01 00:00:00

pages

112-30

issue

1-2

eissn

0378-5955

issn

1878-5891

pii

S0378-5955(04)00214-X

journal_volume

197

pub_type

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