FINGER MOVEMENT RESPONSES OF CUTANEOUS MECHANORECEPTORS IN THE DORSAL SKIN OF THE HUMAN HAND
FINGER MOVEMENT RESPONSES OF CUTANEOUS MECHANORECEPTORS IN THE DORSAL SKIN OF THE HUMAN HAND
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DOI：
10.1152/jn.1991.65.3.657
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发表时间：
1991-03-01
影响因子：
2.5
通讯作者：
ABBS, JH
中科院分区：
文献类型：
--
作者：
EDIN, BB;ABBS, JH
1.本文用单传入记录技术研究了人手背皮肤机械感受器的运动敏感性。2.单位被分类为缓慢（SA）和快速适应（FA），并进一步表征阈值垂直缩进和接收场的大小。SA单位均匀分布于桡神经浅分支的供应区内。FA单位通常位于关节附近。3.不同受体类型的比例（32%SAI，32%SAII，28%FAI，8%FAII; n = 107）与之前的电生理和解剖数据相比，具有优势，认为采样偏倚最小。大多数皮肤机械感受单位是SA，这主要是由于FAII [Pacinian小体（PC）]单位相对稀缺。4.绝大多数（92%）的传入反应积极的手或手指运动。在所有单位类型的反应与观察到的运动引起的变形，他们的感受野是一致的。5. FAI单位双向反应，尽管手指屈曲的放电频率通常较高，但在大多数情况下与皮肤拉伸有关。FAI单位对远程刺激的反应微弱，通常对一个或最多两个相邻关节作出反应。6. SA单位通常表现出简单的方向性反应，关节运动与增加的放电在屈曲和减少放电在伸展。关节运动，影响皮肤内的SA单位的感受野引起分级的反应，即使该领域，作为评估的垂直压痕，是分钟。这一发现表明，经典的垂直压痕皮肤感受野的定义可能是不合适的受体在毛茸茸的，nonglabrous皮肤。7.从这些记录的数据的解释表明，在背部皮肤的皮肤机械感受器可以提供详细的运动信息，至少对于手的运动中枢神经系统。
1. The movement sensitivity of dorsal skin mechanoreceptors in the human hand was studied by the use of single afferent recording techniques. 2. Units were classified as slowly (SA) and fast adapting (FA) and further characterized by thresholds to vertical indentation and by receptive-field sizes. Whereas SA units were evenly distributed within the supply area of the superficial branch of the radial nerve. FA units were usually situated near joints. 3. The proportion of different receptor types (32% SAI, 32% SAII, 28% FAI, 8% FAII; n = 107) compared favorably with previous electrophysiological and anatomic data, arguing for minimal sampling bias. The majority of the skin mechanoreceptive units were SA, largely due to a relative scarcity of FAII [Pacinian corpuscles (PC)] units. 4. A large majority (92%) of the afferents responded to active hand or finger movements. Responses in all unit types were consistent with observed movement-induced deformations of their receptive fields. 5. FAI units responded bidirectionally, albeit usually with somewhat higher discharge frequencies for finger flexion, which in most cases were associated with skin stretch. FAI units showed meager responses to remote stimuli, typically responding to one or, at the most, two adjacent joints. 6. SA units typically showed simple directional responses to joint movements with an increased discharge during flexion and a reduced discharge during extension. Joint movement that influenced the skin within the receptive field of SA units elicited graded responses even if the field, as assessed by perpendicular indentations, was minute. This finding suggests that definition of cutaneous receptive fields by classical perpendicular indentations may be inappropriate for the receptors in the hairy, nonglabrous skin. 7. The interpretation of the data from these recordings suggests that cutaneous mechanoreceptors in the dorsal skin can provide the CNS with detailed kinematic information, at least for movements of the hand.