FUNCTIONAL PROPERTIES OF LEAF-LIKE MUSCLE RECEPTORS IN THE FROG SARTORIUS MUSCLE

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  • 伊藤 文雄
    Department of Physiology, School of Dentistry, Aichi-Gakuin University

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1. The properties of leaf-like receptors were studied by means of an analysis of the discharges recorded from the 9th dorsal root in a frog sartorius muscle-nerve preparation.<BR>2. During isometric contraction of the muscle, about 70% of the discharges from the receptors occurred at the falling phase of the tension curve, and 30% occurred at the rising phase.<BR>3. During muscle shortening against loads, the leaf-like receptors were characterized by their responses in both the first and second upward tension<BR>4. With muscle stretching at constant velocities, the static index increased linearly with increases of the initial length.The static sensitivity ranged from 2.2 to 4.5impulses/sec/mm.The dynamic index was dependent upon the velocity of stretching and on the initial length.<BR>5. The possibility that the excitability of the receptor may resemble that of the tendon receptor was discussed.The different discharge patterns from the two kinds of receptors during various mechanical stimulations may be due to the differences of contractile elements acting on their receptors and also to different visco-elastic properties of the tissues embedded with them. deflections.

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