Variations in vibrissal geometry across the rat mystacial pad: base diameter, medulla, and taper
Variations in vibrissal geometry across the rat mystacial pad: base diameter, medulla, and taper
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DOI：
10.1152/jn.00054.2016
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发表时间：
2017-04-01
影响因子：
2.5
通讯作者：
Hartmann, Mitra J. Z.
中科院分区：
文献类型：
--
作者：
Belli, Hayley M.;Yang, Anne E. T.;Hartmann, Mitra J. Z.
许多啮齿类动物通过触须（胡须）的主动运动来感知世界，触须在脸上有规律地排列成行和列（弧形）。本研究量化了几个几何参数的大鼠胡须，确定所获得的触觉信息。调查结果包括以下内容。1)七项研究的荟萃分析表明，晶须基地直径与弧长的晶须的行内的阵列中的位置有着惊人的强烈的依赖性。2)晶须髓质的长度与晶须长度呈线性关系，髓质的基部直径与晶须基部直径呈线性关系。3)需要两个参数来表征晶须“锥度”：半径比（基部半径除以尖端半径）和半径斜率（基部半径和尖端半径之差，除以弧长）。五项研究的荟萃分析表明，由于尖端半径的变化，半径比表现出较大的变异性，而半径斜率在整个阵列中系统地变化。4)在本研究的分辨率内，触须的近端和远端段之间的半径斜率没有差异，其中“近端”由髓质的存在定义。5)髓质的半径斜率从须状物的近端部分的半径斜率偏移恒定值。最后，我们得出了所有几何参数的方程，这些方程是行和列位置的函数。新&值得注意的是，老鼠通过用胡须刷和敲击物体来触觉地探索它们的世界。每根触须的几何形状都会对其机械结构产生很大的影响，从而影响老鼠获得的触觉信号。我们对七项研究进行了荟萃分析，以生成描述大鼠面部胡须几何形状系统变化的方程。我们还量化了胡须髓质的几何形状。一个数据库提供了500多个大鼠胡须的几何参数。
Many rodents tactually sense the world through active motions of their vibrissae (whiskers), which are regularly arranged in rows and columns (arcs) on the face. The present study quantifies several geometric parameters of rat whiskers that determine the tactile information acquired. Findings include the following. 1) A meta-analysis of seven studies shows that whisker base diameter varies with arc length with a surprisingly strong dependence on the whisker's row position within the array. 2) The length of the whisker medulla varies linearly with whisker length, and the medulla's base diameter varies linearly with whisker base diameter. 3) Two parameters are required to characterize whisker "taper": radius ratio (base radius divided by tip radius) and radius slope (the difference between base and tip radius, divided by arc length). A meta-analysis of five studies shows that radius ratio exhibits large variability due to variations in tip radius, while radius slope varies systematically across the array. 4) Within the resolution of the present study, radius slope does not differ between the proximal and distal segments of the whisker, where "proximal" is defined by the presence of the medulla. 5) Radius slope of the medulla is offset by a constant value from radius slope of the proximal portion of the whisker. We conclude with equations for all geometric parameters as functions of row and column position.NEW & NOTEWORTHY Rats tactually explore their world by brushing and tapping their whiskers against objects. Each whisker's geometry will have a large influence on its mechanics and thus on the tactile signals the rat obtains. We performed a meta-analysis of seven studies to generate equations that describe systematic variations in whisker geometry across the rat's face. We also quantified the geometry of the whisker medulla. A database provides access to geometric parameters of over 500 rat whiskers.