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Sensorimotor pathways involved in interjoint reflex action of an insect leg

✍ Scribed by Hess, Dietmar ;B�schges, Ansgar

Publisher
John Wiley and Sons
Year
1997
Tongue
English
Weight
499 KB
Volume
33
Category
Article
ISSN
0022-3034

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✦ Synopsis

Coordination of motor output be-EPSPs in levator motoneurons, providing evidence for tween leg joints is crucial for the generation of posture direct connections between fCO afferents and levator and active movements in multijointed appendages of motoneurons. In addition, neuronal pathways via inlegged organisms. We investigated in the stick insect tercalated interneurons were identified that transmit the information flow between the middle leg femoral sensory information from the fCO onto levator and/ chordotonal organ ( fCO), which measures position or depressor motoneurons. Finally, we describe two and movement in the femur-tibia (FT) joint and the kinds of alterations in interjoint reflex action: (a) motoneuron pools supplying the next proximal leg With repetitive sensory stimulation, this interjoint joint, the coxa-trochanteral (CT) joint. In the inactive reflex action shows a habituation-like decrease in animal, elongation of the fCO (by flexing the FT strength. (b) In the actively moving animal, interjoint joint) induced a depolarization in eight of nine levator reflex action in response to fCO elongation, mimicktrochanteris motoneurons, with a suprathreshold actiing joint flexion, qualitatively remained the same sign, vation of one to three motoneurons. Motoneurons of but with a marked increase in strength, indicating an the depressor trochanteris muscle were inhibited by increased influence of sensory signals from the FT fCO elongation. Relaxation signals, i.e., extension of joint onto the adjacent CT joint in the active animal. the FT joint, activated both levator and depressor mo-

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