Somatic versus Vestibular Gravity Reception in Man
Somatic versus Vestibular Gravity Reception in Man
复制标题
人体重力接收与前庭重力接收
DOI：
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发表时间：
1992
影响因子：
5.2
通讯作者：
H. Mittelstaedt
中科院分区：
文献类型：
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作者：
H. Mittelstaedt
为了评估前庭外重力感受器相对于耳石对身体位置的感知和控制的影响，受试者（S）在可倾斜板和滑橇离心机上暴露于沿脊柱（Z）轴的重力惯性力沿着。结果表明：（1）这两种效应平均来说是同样强的，尽管在不同的Ss之间有相当大的差异;（2）支配躯体感受器的质量的质心位于躯体的质心附近;（3）躯体重力感受包含两个明显不同的系统。这两个出现未受损的截瘫SS与总双侧感觉丧失（TSL）从第5至第1腰椎节段。一个是躯干系统，从第11胸段以上用TSL消除。还有一个在TSL直到第6颈椎节段（包括第6颈椎节段）仍然有效，在整个范围内具有相同的有效性。因此，它一定是由迷走神经或（不太可能）交感神经传入介导的，也就是说，可能是由重力对心血管系统的影响介导的。躯干系统的传入似乎在最后两个胸段进入脊髓，这支持了早期关于肾脏过度静止功能的假设。事实上，在倾斜板上，7个双侧肾切除的Ss表现得像截瘫患者，TSL在T11和C6之间，但在预测的方向上与正常对照组有显著差异。
In order to assess the effect of extravestibular gravity receptors on perception and control of body position against that of the otoliths, the subject (S) is exposed to gravitoinertial forces along the spinal (Z) axis on a tiltable board and on a sled centrifuge. It turns out that (1) both effects, on average, are equally strong, although with considerable variance between Ss; (2) the centroid of the mass(es) governing the somatic receptors lies near the centroid of the body; and (3) somatic gravity reception contains two distinctly different systems. Both appear unimpaired in paraplegic Ss with total bilateral sensory loss (TSL) from the 5th to the 1st lumbar spinal segment. One, the truncal system, is eliminated with TSL from the 11th thoracic segment upwards. Yet another is still functioning with TSL up to and including the 6th cervical segment, with the same effectiveness throughout this range. Hence it must be mediated by vagal or, less likely, sympathetic afference, that is, probably, by the influence of gravity on the cardiovascular system. That the afference of the truncal system appears to enter the cord at the last two thoracic segments supports earlier conjectures about a supererogatory static function of the kidneys. In fact, on the tiltable board, 7 bilaterally nephrectomized Ss behaved like paraplegics with TSL between T11 and C6, yet differed significantly in the predicted direction from the normal controls.