Quantification of vibrissal mechanical properties across the rat mystacial pad

Journal of Neurophysiology
Anne En-Tzu YangMitra J Hartmann

Abstract

Recent work has quantified the geometric parameters of individual rat vibrissae (whiskers) and developed equations that describe how these parameters vary as a function of row and column position across the array. This characterization included a detailed quantification of whisker base diameter and arc length as well as the geometry of the whisker medulla. The present study now uses these equations for whisker geometry to quantify several properties of the whisker that govern its mechanical behavior. We first show that the average density of a whisker is lower in its proximal region than in its distal region. This density variation appears to be largely attributable to the presence of the whisker cuticle rather than the medulla. The density variation has very little effect on the center of mass of the whisker. We next show that the presence of the medulla decreases the deflection of the whisker under its own weight and also decreases its mass moment of inertia while sacrificing <1% stiffness at the whisker base compared with a solid whisker. Finally, we quantify two dimensionless parameters across the array. First, the deflection-to-length ratio decreases from caudal to rostral: caudal whiskers are longer but deflect more under...Continue Reading

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Citations

Feb 15, 2021·Current Opinion in Neurobiology·Christian L Ebbesen, Robert C Froemke
Apr 9, 2021·Frontiers in Neuroanatomy·Vlad TereshenkoKonstantin D Bergmeister

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