Spinal cord coordination of hindlimb movements in the turtle: Intralimb temporal relationships during scratching and swimming

被引:34
作者
Field, EC
Stein, PSG
机构
[1] WASHINGTON UNIV, DEPT BIOL, ST LOUIS, MO 63130 USA
[2] WASHINGTON UNIV, PROGRAM MOVEMENT SCI, ST LOUIS, MO 63130 USA
关键词
D O I
10.1152/jn.1997.78.3.1394
中图分类号
Q189 [神经科学];
学科分类号
071006 ;
摘要
Spinal cord neuronal circuits generate motor neuron activity patterns responsible for rhythmic hindlimb behaviors such as scratching and swimming. Kinematic analyses of Limb movements generated by this motor neuron output reveal important characteristics of these behaviors. Intralimb kinematics of the turtle hindlimb were characterized during five distinct rhythmic forms of behavior: three forms of scratching and two forms of swimming. In each movement cycle for each form, the angles of the hip and knee joints were measured as well as the tinting of a behavioral event, e.g., rub onset in scratching or powerstroke onset in swimming. There were distinct differences between the kinematics of different forms of the same behavior, e.g., rostral scratch versus pocket scratch. In contrast, there were striking similarities between forms of different behaviors, e.g., rostral scratch versus forward swimming. For each form of behavior there was a characteristic angular position of the hip at the onset of each behavioral event (rub or powerstroke). The phase of the onset of knee extension within the hip position cycle occurred while the hip was flexing in the rostral scratch and forward swim and while the hip was extending in the pocket scratch, caudal scratch, and back-paddling form of swimming. The phase of the onset of the behavioral event was not statistically different between rostral scratch and forward swim; nor was it different between pocket scratch and caudal scratch. These observations of similarities at the movement level support the suggestion that further similarities, such as shared spinal circuitry, may be present at the neural circuitry level as well.
引用
收藏
页码:1394 / 1403
页数:10
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