家兔外膝体背核中继细胞的被动电缆特性

PASSIVE CABLE PROPERTIES OF RELAY CELLS IN DORSAL LATERAL GENICULATE NUCLEUS OF THE RABBIT

在离体脑片上测定了２４个家兔外膝体中继细胞的被动膜特性。它们的静息电位为－６２．７±４．１ｍＶ（ＳＤ）；膜输入阻抗为３０．４±１１．２ＭΩ。运用Ｒａｌｌ的线性电缆模型，计算出这些神经元树突的电紧张长度（Ｌ）为０．７９±０．１３；电压衰减因数（Ｈ）为回．３３±０．１１。说明家兔外膝体中继细胞是电学紧密的，树突远端的电位可扩散到胞体，幅度仅衰减２５％左右。

We measured the passive membrane properties of 24 relay cells in slice preparationof the lateral geniculate nucleus of the rabbit. The resting membrane potential was-62. 7 ± 4. 1 mV with an input resistance of 30. 4 ±11. 2 MΩ. Accordingto Rall′ s linear cable model, the electrotonic length (L) of the dendrite was 0. 79 ±0. 13. The voltage attenuation factor (H) was 1. 33 ± 0. 11. All these indicated thatthe relay cells were electrically compact. DC voltages on the distal dendrite could spreadto the soma attenuated only by 25 %.