鸽子中辅助视器单元的视网膜外调制

Extraretinal modulation of accessory optic units in the pigeon.

Nogueira M I, Britto L R

Departamento de Fisiologia e Biofisica, Universidade de São Paulo, Brasil.

Braz J Med Biol Res. 1991;24(6):623-31.

Abstract

Electrophysiological methods were used to investigate the pretectal and telencephalic control of units within the nucleus of the basal optic root (nBOR) of the accessory optic system of pigeons. 2. Electrical stimulation of the pretectal lentiform nucleus mainly produced excitatory effects on nBOR units with temporal-to-nasal directional preference (among 109 cells, 51% were excited, 23% were inhibited and 23% were not affected) and inhibitory effects on units with nasal-to-temporal preferences (among 88 cells, 43% were inhibited, 38% were not affected, and 19% were excited). 3. Electrical stimulation of the visual Wulst (considered to be the equivalent of the visual cortex) produced mainly inhibitory effects on units with downward preferences (among 123 units, 47% were inhibited, 24% were excited and 29% were not affected), and mixed effects on units with upward preferences (among 70 cells, 30% were excited, 36% were inhibited and 34% were not affected). 4. Excitatory effects of LM stimulation had first-spike latencies ranging from 2-20 ms (mean +/- SEM, 5.5 +/- 0.7 ms), whereas latencies of W stimulation ranged from 6 to 30 ms (13.0 +/- 0.9 ms). 5. These results provide additional information about the neural substrates of the optokinetic nystagmus.

摘要

采用电生理方法研究鸽子副视系统基底视根核（nBOR）内单位的顶盖前区和端脑控制。2. 顶盖前区豆状核的电刺激主要对具有颞侧到鼻侧方向偏好的nBOR单位产生兴奋作用（在109个细胞中，51%被兴奋，23%被抑制，23%未受影响），而对具有鼻侧到颞侧偏好的单位产生抑制作用（在88个细胞中，43%被抑制，38%未受影响，19%被兴奋）。3. 对视上丘（被认为相当于视觉皮层）的电刺激主要对具有向下偏好的单位产生抑制作用（在123个单位中，47%被抑制，24%被兴奋，29%未受影响），而对具有向上偏好的单位产生混合作用（在70个细胞中，30%被兴奋，36%被抑制，34%未受影响）。4. 外侧丘系（LM）刺激的兴奋作用的首次放电潜伏期为2 - 20毫秒（平均值±标准误，5.5±0.7毫秒），而视上丘（W）刺激的潜伏期为6至30毫秒（13.0±0.9毫秒）。5. 这些结果为视动性眼球震颤的神经基质提供了更多信息。