兔耳廓血管床的收缩与三叉神经降压反应相伴出现。

Constriction of the ear pinna vascular bed accompanies the trigeminal depressor response in rabbits.

作者信息

Yu Y H, Blessing W W

机构信息

Department of Physiology, Centre for Neuroscience, Flinders University, Bedford Park, Australia.

出版信息

Neurosci Lett. 1998 Oct 23;255(3):172-4. doi: 10.1016/s0304-3940(98)00717-4.

DOI:10.1016/s0304-3940(98)00717-4

PMID:9832200

Abstract

Electrical stimulation of the spinal tract of the trigeminal nerve at 5 Hz to elicit the trigeminal depressor response in anesthetized rabbits also causes an acute fall in ear pinna blood flow to near zero levels (from 31+/-8 to 2+/-2 kHz, n = 5, P < 0.01). This active vasoconstriction in the ear artery contrasts with the active vasodilation in femoral, renal and mesenteric arteries known to be part of the trigeminal depressor response. The selective vasoconstriction observed in the ear bed in response to noxious stimulation in anesthetized rabbits is similar to the vigorous acute vasoconstriction occurring in this cutaneous bed in conscious rabbits responding to salient environmental stimuli.

摘要

以5赫兹的频率电刺激麻醉兔的三叉神经脊髓束以引发三叉神经降压反应，也会导致耳廓血流量急剧下降至接近零水平（从31±8降至2±2千赫兹，n = 5，P < 0.01）。耳动脉中的这种主动血管收缩与已知作为三叉神经降压反应一部分的股动脉、肾动脉和肠系膜动脉中的主动血管舒张形成对比。在麻醉兔中观察到的针对有害刺激的耳床选择性血管收缩，类似于清醒兔中该皮肤床对显著环境刺激作出反应时发生的剧烈急性血管收缩。