A COMPARISON OF SPINDLE CONCENTRATIONS IN LARGE AND SMALL MUSCLES ACTING IN PARALLEL COMBINATIONS
A COMPARISON OF SPINDLE CONCENTRATIONS IN LARGE AND SMALL MUSCLES ACTING IN PARALLEL COMBINATIONS
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DOI：
10.1002/jmor.1051800307
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发表时间：
1984-01-01
影响因子：
1.5
通讯作者：
NITZ, A
中科院分区：
文献类型：
--
作者：
PECK, D;BUXTON, DF;NITZ, A
一个小的短肌肉经常与一个更大更长的肌肉平行地穿过关节;因此它在该关节的机械控制中应该发挥最小的作用。这项研究提供的证据表明，这种平行肌肉组合（PMC）的小成员可能担任重要的感觉反馈作用。本文测定并比较了人和狗PMC大、小细胞的纺锤体密度。解剖控制犬椎间关节的轴向PMC，将组织样本包埋在石蜡中，沿肌肉长轴横切，并用苏木精-高碘酸-希夫染色。将代表性组织切片投影到体视学网格上，并确定纺锤体的体积百分比。文献中现有的数据用于确定人PMC控制颈枕区和四肢关节的纺锤体密度。列出了控制特定运动的一组PMC中每一块肌肉的纺锤体密度，并确定了该组中大肌肉和小肌肉的平均纺锤体密度。使用Students非配对t检验确定平均纺锤体密度之间差异的显著性。计算线性回归，并将数据作图。在所有PMC检查，梭密度的小肌肉是显着高于他们的大同行。因此，建议PMC的小肌肉可能作为运动监测器产生重要的本体感受反馈到中枢神经系统。
A small short muscle frequently acts across a joint in parallel with a vastly larger and longer muscle; therefore it should play a minimal role in the mechanical control of that joint. This study provides evidence suggesting that the small member of such a parallel muscle combination (PMC) may serve an important sensory feedback role. The spindle densities of large and small members of PMC in man and the dog were determined and compared. Epaxial PMC controlling canine intervertebral joints were dissected and tissue samples were embedded in paraffin, sectioned transversely to the muscles'' long axis and, stained with hematoxylin-periodic acid-Schiff. Representative tissue sections were projected on to stereological grids and the percentage volume of spindles was determined. Data existing in the literature were used to ascertain spindle densities in human PMC controlling joints in the cervico-occipital region and the extremities. The spindle density for each muscle in a group of PMC controlling a particular motion was listed, and the mean spindle densities were determined for both the large and the small members of the group. Students'' unpaired t test was used to determine the significance of the differences between mean spindle densities. Linear regression was calculated and the data were plotted graphically. In all PMC examined, the spindle density of the small muscles was significantly higher than that of their large counterparts. It is therefore proposed that the small muscles of PMC may function as kinesiological monitors generating important proprioceptive feedback to the CNS.