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首页> 外文期刊>Journal of Neurophysiology >Vertical cell responses to sound in cat dorsal cochlear nucleus.
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Vertical cell responses to sound in cat dorsal cochlear nucleus.

机译：垂直细胞对猫背侧耳蜗核中声音的反应。

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摘要

The dorsal cochlear nucleus receives input from the auditory nerve and relays acoustic information to the inferior colliculus. Its principal cells receive two systems of inputs. One system through the molecular layer carries multimodal information that is processed through a neuronal circuit that resembles the cerebellum. A second system through the deep layer carries primary auditory nerve input, some of which is relayed through interneurons. The present study reveals the morphology of individual interneurons and their local axonal arbors and how these inhibitory interneurons respond to sound. Vertical cells lie beneath the fusiform cell layer. Their dendritic and axonal arbors are limited to an isofrequency lamina. They give rise to pericellular nests around the base of fusiform cells and their proximal basal dendrites. These cells exhibit an onset-graded response to short tones and have response features defined as type II. They have tuning curves that are closed contours (0 shaped), thresholds approximately 27 dB SPL, spontaneous firing rates of approximately 0 spikes/s, and they respond weakly or not at all to broadband noise, as described for type II units. Their responses are nonmonotonic functions of intensity with peak responses between 30 and 60 dB SPL. They also show a preference for the high-to-low direction of a frequency sweep. It has been suggested that these circuits may be involved in the processing of spectral cues for the localization of sound sources.
机译：耳蜗背侧核从听神经接收输入，并将声学信息传递到下丘。它的主要单元接收两个输入系统。一个贯穿分子层的系统携带着多峰信息，该信息通过类似于小脑的神经元回路进行处理。穿过深层的第二个系统携带主听神经输入，其中一些通过中间神经元传递。本研究揭示了单个中间神经元及其局部轴突轴突的形态，以及这些抑制性中间神经元对声音的反应。垂直细胞位于梭形细胞层下方。它们的树突状和轴突状的乔木仅限于等频率的薄片。它们在梭形细胞及其近端基底树突的基部周围形成细胞周围的巢。这些细胞表现出对短音的发作分级应答，并且具有定义为II型的应答特征。它们具有闭合轮廓（0形），大约27 dB SPL的阈值，大约0尖峰/秒的自发发射速率的调谐曲线，并且它们对宽带噪声的响应很弱或根本没有响应，如针对II型单元所述。它们的响应是强度的非单调函数，峰值响应在30至60 dB SPL之间。它们还显示了对频率扫描从高到低方向的偏爱。已经提出，这些电路可能参与用于声源定位的频谱提示的处理。

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