PROJECTIONS FROM PACINIAN CORPUSCLES AND RAPIDLY ADAPTING MECHANORECEPTORS OF GLABROUS SKIN TO THE CATS SPINAL-CORD
PROJECTIONS FROM PACINIAN CORPUSCLES AND RAPIDLY ADAPTING MECHANORECEPTORS OF GLABROUS SKIN TO THE CATS SPINAL-CORD
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DOI：
10.1113/jphysiol.1980.sp013441
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发表时间：
1980-01-01
影响因子：
5.5
通讯作者：
NOBLE, R
中科院分区：
文献类型：
--
作者：
BROWN, AG;FYFFE, REW;NOBLE, R
在用氯醛糖麻醉并用三碘化镓胺麻痹的猫中，在靠近腰骶脊髓入口处向支配帕西尼小体和足部和脚趾垫的快速适应机械感受器的单轴突注射辣根过氧化物酶。随后的组织化学揭示了轴突脊髓内部分的形态。所有帕西尼亚小体轴突。所有追踪到背根的帕西尼亚小体轴突在进入绳索进入上升和下降分支时分叉。所有帕西尼亚小体轴突都会产生进入背角的侧支循环。帕西尼小体传入纤维的侧枝具有独特的形态。它们提供了 2 个终止区域，第 III 和 IV 层中较大的背侧区域，以及第 V 和 VI 层中较小的腹侧区域。在背侧区域内，末端轴突主要沿绳索的纵轴延伸，并携带许多传递的纽扣。在腹侧区域内，轴突在脊髓的横向平面中背腹延伸。虽然路过时携带了一些胸花，但它们却产生了成簇的胸花。快速适应传入纤维的侧枝具有与帕西尼小体传入纤维侧枝不同的独特形态。快速适应传入神经的终止区域几乎完全限于第三层，仅轻微延伸至第四层。布顿主要是经过型的，末端轴突通常定向在绳索的纵轴内。讨论了与背角生理学相关的传入纤维络脉的形态。
Single axons innervating Pacinian corpuscles and rapidly adapting mechanoreceptors of the foot and toe pads were injected with horseradish peroxidase near their entrance of the lumbosacral spinal cord in cats anesthetized with chloralose and paralyzed with gallamine triethiodide. Subsequent histochemistry revealed the morphology of the intra-spinal parts of the axons. All Pacinian corpuscle axons. All Pacinian corpuscle axons that traced into the dorsal root bifurcated upon entering the cord into ascending and descending branches. All Pacinian corpuscle axons gave rise to collaterals entering the dorsal horn. The collaterals of Pacinian corpuscle afferent fibers had a distinctive morphology. They provided 2 regions of termination, a larger dorsal region in laminae III and IV and a smaller ventral region in laminae V and VI. Within the dorsal region the terminal axons ran mainly in the longitudinal axis of the cord and carried many boutons en passant. Within the ventral region the axons ran dorso-ventrally in the transverse plane of the cord. Although carrying some boutons en passant, they gave rise to clusters of boutons. The collaterals of rapidly adapting afferent fibers had a distinctive morphology different from the Pacinian corpuscle afferent fiber collaterals. The termination region of rapidly adapting afferents was limited almost exclusively to lamina III, with only slight extension into lamina IV. Boutons were mainly of the en passant type and terminal axons were generally orientated within the longitudinal axis of the cord. The morphology of the afferent fiber collaterals in relation to the physiology of the dorsal horn is discussed.