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首页> 外文期刊>Journal of Neurophysiology >Physiological identification of morphologically distinct afferent classes innervating the cristae ampullares of the squirrel monkey.
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Physiological identification of morphologically distinct afferent classes innervating the cristae ampullares of the squirrel monkey.

机译：生理学上识别松鼠猴classes壶腹的传入类的生理学鉴定。

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1. Semicircular-canal afferents in the squirrel monkey were characterized by their resting discharge, discharge regularity, sensitivity to galvanic currents delivered to the ear (beta *), the gain (g2Hz), and phase lead (phi 2Hz) of their response to 2-Hz sinusoidal head rotations, and their antidromic conduction velocity. Discharge regularity was measured by a normalized coefficient of variation (CV*); the higher the CV*, the more irregular the discharge. g2Hz and phi 2Hz were expressed relative to angular head velocity. 2. These physiological measures were used in an attempt to discern the discharge properties of the three morphological classes of afferents innervating the crista. Presumed bouton (B) fibers were identified as slowly conducting afferents. Presumed calyx (C) fibers were recognized by their irregular discharge and low rotational gains. The remaining fibers were considered to be dimorphic (D) units. Single letters (B, C, and D) are used to emphasize that the classification is based on circumstantial evidence and may be wrong for individual fibers. Of the 125 identified fibers, 13 (10%) were B units, 36 (29%) were C units, and 76 (61%) were D units. 3. B units were regularly discharging D units ranged from regularly to irregularly discharging. C units were the most irregularly discharging afferents encountered. The mean resting discharge for the entire sample was 74 spikes/s. Resting rates were similar for regularly discharging B and D units and higher than those for irregularly discharging C and D units. 4. Except for their lower conduction velocities, the discharge properties of B units are indistinguishable from those of regularly discharging D units. Many of the discharge properties of B and D units vary with discharge regularity. There is a strong, positive relation when beta *, g2Hz, or phi 2Hz is plotted against CV*. For beta * or phi 2Hz, C units conform to the relation for B and D units. In contrast, values of g2Hz for C units are three to four times lower than predicted from the relation for the other two classes. 5. Internal (axon) diameters (dp) of peripheral vestibular-nerve fibers were estimated from central antidromic conduction velocities. Thick fibers (dp > or = 49 microns) were irregularly discharging, mostly C units. Medium-sized fibers (dp = 1.5-4 microns) included regular, intermediate, and irregular D units, as well as C units. Thin fibers (dp < or = 1.5 microns) were defined as B units.(ABSTRACT TRUNCATED AT 400 WORDS)
机译：1.松鼠猴的半规管输入的特征在于其静息放电，放电规律性，对传递到耳朵的电流的灵敏度（β*），增益（g2Hz）和其对响应的相位超前（phi 2Hz） 2 Hz正弦波头部旋转及其反行传导速度。放电规律性通过标准化的变异系数（CV *）进行测量; CV *越高，放电越不规则。 g2Hz和phi 2Hz相对于角头速度表示。 2.采取这些生理措施来试图辨别支配crista的三种形态的传入神经的放电特性。假定的钮扣（B）纤维被确定为传导缓慢的传入纤维。假定的花萼（C）纤维因其不规则放电和低旋转增益而被识别。其余纤维被认为是双晶（D）单元。单个字母（B，C和D）用于强调分类是基于间接证据，对于单个纤维可能是错误的。在鉴定出的125根纤维中，有13根（10％）是B单元，有36根（29％）是C单元，有76根（61％）是D单元。 3. B单元定期排放D单元从定期排放到不定期排放。 C单位是遇到的最不规则的出入者。整个样品的平均静息放电为74峰值/秒。定期排放B和D单元的静息率相似，高于不定期排放C和D单元的静息率。 4.除了其较低的传导速度外，B单元的放电特性与规则放电的D单元的特性没有区别。 B和D单元的许多放电特性会随放电规律而变化。当针对CV *绘制beta *，g2Hz或phi 2Hz时，存在很强的正相关关系。对于beta *或phi 2Hz，C单位符合B和D单位的关系。相反，C单位的g2Hz值比其他两类关系的预测值低三到四倍。 5.外围前庭神经纤维的内（轴突）直径（dp）是根据中心反线传导速度估算的。粗纤维（dp>或= 49微米）不规则地放电，大部分为C单位。中型纤维（dp = 1.5-4微米）包括规则的，中间的和不规则的D单位，以及C单位。细纤维（dp <或= 1.5微米）被定义为B单位（抽象截断为400字）

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