筋の相性伸展に対する筋紡錘および腱器官発射について

概要

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The responses of muscle receptors and Golgi tendon organ to the phasic stretch of alterable velocity of the triceps surae muscle of adult cats were recorded from dorsal root filaments; GIa, Gil, GIb fibers. The results are as follows. 1. The higher the stretch velocity, the shorter the response time of the first spike from the onset of phasic stretch. 2. The minimum stretch velocity to evoke the first response in these fibers were as follows: GIa = 3mm/sec. (0-12.5mm/sec), GII = 29mm/sec. (9-60mm/sec), GIb = 10 mm/sec. (2-26 mm/sec). This result shows the most sensitive stretch receptor to phasic stretch in the primary ending, and the second is Golgi tendon organ, and the last is the secondary ending. 3. The relationship between the first spike of response and stretch velocity was inspected. The first spike response time of GIa and GIb decreased steeply responding to the increase of stretch velocity from slow stretch to fast stretch of about 30-40mm/sec, thereafter, the decreasing of the response time was small. The response time of the first spike of the secondary ending discharge did not decrease so much according to the increase of stretch velocity. This seems that the secondary ending is not so sensitive to phasic stretch.
千葉大学の論文