Deliagnina T G, Feldman A G, Gelfand I M, Orlovsky G N
Brain Res. 1975 Dec 19;100(2):297-313. doi: 10.1016/0006-8993(75)90484-9.
Rhythmical scratching movements of the hindlimb were evoked in decerebrate and decapitate cats by stimulation of C1-C2 segments of the spinal cord. Movements of the limb and electrical activity of its muscles were recorded. All muscles were divided into two groups according to their activity. Muscles of the first group supported the limb in a propriate position; they were active during most of the cycle and relaxed during small intervals when muscles of the second group contracted. A deafferented limb was also capable of rhythmical scratching movements with approximately the same cycle duration. However, after deafferentation, the mean position of the limb changed and the amplitude of oscillations increased. This is due mainly to decreased activity of the first group muscles. In curarized preparations, stimulation of C1-C2 segments evoked a rhythmical process within the lumbosacral spinal cord ('fictive' scratching) with a cycle duration nearly the same as in normal scratching. Electrical activity of the muscle nerves during 'fictive' scratching resembled that of corresponding muscles during normal movements. 'Fictive' scratching could be easily elicited provided that the limb was put in a position similar to that of normal scratching.
通过刺激脊髓的C1 - C2节段，在去大脑和断头的猫中诱发后肢的节律性搔抓运动。记录肢体的运动及其肌肉的电活动。根据肌肉的活动情况将所有肌肉分为两组。第一组肌肉使肢体保持适当的位置；它们在大部分周期内处于活动状态，在第二组肌肉收缩的小时间段内放松。去传入神经的肢体也能够进行节律性搔抓运动，其周期持续时间大致相同。然而，去传入神经后，肢体的平均位置发生了变化，振荡幅度增加。这主要是由于第一组肌肉的活动减少。在箭毒化的标本中，刺激C1 - C2节段在腰骶脊髓内诱发一个节律性过程（“虚构”搔抓），其周期持续时间与正常搔抓几乎相同。“虚构”搔抓期间肌肉神经的电活动类似于正常运动期间相应肌肉的电活动。只要将肢体置于与正常搔抓相似的位置，就很容易诱发“虚构”搔抓。
