猫中锥体对丘脑腹侧核的影响。

Pyramidal influences on ventral thalamic nuclei in the cat.

作者信息

Giuffrida R, Li Volsi G, Pantó M R, Perciavalle V, Urbano A

出版信息

Brain Res. 1983 Nov 21;279(1-2):254-7. doi: 10.1016/0006-8993(83)90187-7.

Abstract

In pericruciate cortex-ablated 'pyramidal cats', discharge changes in single neurons of ventral thalamic nuclei were studied, following stimulation of ipsilateral medullary (MPT) and contralateral cervical (CPT) pyramidal tract. It was seen that cells in ventrolateral nucleus, ventroanterior nucleus and ventromedial nucleus were not significantly (2.2%) modified by impulses coming from MPT and CPT. Conversely, a very high percentage (58.8%) of cells in ventrobasal complex (VB) responded to MPT stimulation (64.4% in ventroposterolateral nucleus, VPL, and 40.7% in ventroposteromedial nucleus, VPM). A considerable number (34.8%) of VPL cells responsive to MPT, were influenced by CPT, while none of the cells in VPM were. The most frequent effect observed in VB neurons, on MPT and CPT stimulation, was excitation followed by depression of discharge.

摘要

在切除了十字周皮质的“锥体猫”中，在刺激同侧延髓（MPT）和对侧颈髓（CPT）锥体束后，研究了腹侧丘脑核单个神经元的放电变化。结果发现，来自MPT和CPT的冲动对腹外侧核、腹前核和腹内侧核中的细胞没有显著（2.2%）影响。相反，腹侧基底复合体（VB）中很高比例（58.8%）的细胞对MPT刺激有反应（腹后外侧核，VPL，为64.4%，腹后内侧核，VPM，为40.7%）。相当数量（34.8%）对MPT有反应的VPL细胞受CPT影响，而VPM中的细胞均不受影响。在VB神经元中，对MPT和CPT刺激观察到的最常见效应是放电先兴奋后抑制。