STRUCTURE AND PHYSIOLOGY OF LOCUST FEMORAL CHORDOTONAL ORGAN
STRUCTURE AND PHYSIOLOGY OF LOCUST FEMORAL CHORDOTONAL ORGAN
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DOI：
10.1016/0022-1910(74)90236-4
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发表时间：
1974-01-01
影响因子：
2.2
通讯作者：
BURNS, MD
中科院分区：
文献类型：
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作者：
BURNS, MD
蝗虫前胸足和中胸足的股骨中的结缔脊索器官（CO）分为近端蜈蚣和远端蜈蚣两部分。近端颅骨含有约 150 个小神经元，固定在股骨角质层上。远端颅骨含有约 50 个较大的神经元，并在其近端连接到角质层和胫骨屈肌。记录是从远端颅骨进行的，按尖峰大小对单元进行分类。胫骨位置/总活动响应曲线是∪形，但当选择少量单位时，仅当胫骨位于其中心位置的一侧时才会发生响应。强直反应表现出相当大的滞后性和随胫骨角度变化的适应程度。具有相位和相位紧张响应的单元很常见，它们的响应能力取决于胫骨移动的角度范围。相同的单位对胫骨固定或自由的屈肌收缩反应强烈，因此可以作为该肌肉张力的受体。CO 介导所有三个伸肌胫骨运动神经元的阶段性阻力反射和伸肌“慢”神经元的强直反射。建议以复杂的方式使用 CO 提供的非常详细的信息来控制股骨肌肉。
The connective chordotonal organs (COs) in the femora of the prothoracic and mesothoracic legs of the locustSchistocerca gregariaare divided into two parts, the proximal and the distal scoloparia. The proximal scoloparium contains about 150 small neurons and is anchored to the femoral cuticle. The distal scoloparium contains about 50 larger neurons and is connected at its proximal end to both the cuticle and the flexor tibiae muscle.Records were made from the distal scoloparium, classifying units by spike size. The tibial position/total activity response curve is ∪-shaped but when a small number of units is selected the responses occur only when the tibia is on one side of its centre position. The tonic responses display considerable hysteresis and a degree of adaptation which varies with the tibial angle. Units with phasic and phasic-tonic responses are common and their responsiveness depends on the range of angles the tibia is moved through. The same units respond strongly to flexor tibiae contraction with the tibia either fixed or free, and so may serve as receptors for tension in that muscle.The CO mediates phasic resistance reflexes in all three extensor tibiae motoneurons and tonic reflexes in the extensor ‘slow’ neuron. It is suggested that the very detailed information furnished by the CO is used in a complex way in the control of the femoral muscles.