The sensory trigeminal system in birds: Input, organization and effects of peripheral damage. A review
The sensory trigeminal system in birds: Input, organization and effects of peripheral damage. A review
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DOI：
10.1076/apab.106.5.338.4367
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发表时间：
1998-12-01
影响因子：
3
通讯作者：
Dubbeldam, JL
中科院分区：
文献类型：
--
作者：
Dubbeldam, JL
鸟类的初级感觉三叉神经系统包括三叉神经中脑核和与主感觉核（PrV）和降束及其亚核的投射的三叉神经节。其他脑神经可以对PrV和下行系统做出贡献，它们共同形成头部的躯体感觉系统。还有一个本体感受成分。躯体感觉系统包括用于触觉的成分和伤害感受成分。前者处理来自喙和舌中许多机械感受器的信息; PrV和下行系统的亚核都参与其中。伤害性感受成分由小神经节细胞组成，可能投射到三叉神经降系尾侧亚核和颈后角的I层和TI层;这是唯一显示P物质免疫反应性的三叉神经区域。（去喙）通过支配该区域的三叉神经分支的电子显微镜制备物中的纤维计数来估计，以及通过三叉神经节的尼氏染色切片中的细胞计数。我们的数据表明，去喙导致外感受单位的损失，但不是伤害性单位。比较P物质（免疫组织化学）染色的切片，没有发现对伤害性系统的长期影响，提示慢性疼痛的发生。
The primary sensory trigeminal system in birds comprises the mesencephalic trigeminal nucleus and the brigeminal ganglion with projections to the principal sensory nucleus (PrV) and the descending tract with its subnuclei. Other cranial nerves can contribute to PrV and the descending system that together form the somatosensory system of the head. There is also a proprioceptive component. The somatosensory system comprises a component serving tactile sense and a nociceptive component. The former processes information from many mechanoreceptors in beak and tongue; both PrV and subnuclei of the descending system are involved. The nociceptive component consists of small ganglion cells projecting presumably to layers I and TI of the caudal subnucleus of the descending trigeminal system and cervical dorsal horn; this is the only trigeminal region showing immunoreactivity for substance P. The effects of amputation of the tips of the beak of chickens (debeaking) are estimated by fiber counts in electron microscopic preparations of the trigeminal branches innervating that area, and by cell counts in Nissl stained sections of the trigeminal ganglion. Our data indicate that debeaking causes a loss of exteroceptive units, but not of nociceptive units. Comparison of sections stained for the presence of substance P (immunohistochemistry) did not reveal a long-term effect on the nociceptive system suggestive of the occurrence of chronic pain.