Disynaptic group I excitation of synergist ankle extensor motoneurones during fictive locomotion in the cat.
نویسندگان
چکیده
منابع مشابه
Candidate interneurones mediating group I disynaptic EPSPs in extensor motoneurones during fictive locomotion in the cat.
In the present study we sought to find interneurones responsible for the group I-evoked disynaptic excitation of hindlimb extensor motoneurones that occurs during fictive locomotion. Locomotion was produced by stimulation of the mesencephalic locomotor region (MLR) in decerebrate paralysed cats in which activation of ankle extensor group I afferents evoked a disynaptic excitation of motoneurone...
متن کاملGroup I disynaptic excitation in flexor and bifunctional motoneurons during locomotion.
In the absence of locomotion, activation of extensor muscle spindle (Ia) and tendon organ (Ib) afferents evokes a widespread pattern of interneuronally mediated inhibition and excitation through the non-reciprocal reflex systems (1). During the extension phase of fictive locomotion, however, the same afferents evoke a disynaptic excitation of extensor motoneurons (2). Recently it has been repor...
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Contact between the dorsum of a hindlimb paw and an obstacle during the swing phase of locomotion evokes a specific pattern of muscle activation in an attempt to avoid tripping. This pattern has been termed the stumbling corrective reaction (1) and consists of a cessation of activity in ankle flexor muscles and an onset of activity in knee flexors and the ankle extensor, lateral gastrocnemius. ...
متن کاملStumbling corrective reaction during fictive locomotion in the cat.
An obstacle contacting the dorsal surface of a cat's hind foot during the swing phase of locomotion evokes a reflex (the stumbling corrective reaction) that lifts the foot and extends the ankle to avoid falling. We show that the same sequence of ipsilateral hindlimb motoneuron activity can be evoked in decerebrate cats during fictive locomotion. As recorded in the peripheral nerves, twice thres...
متن کاملPhase Locking Asymmetries at Flexor-Extensor Transitions during Fictive Locomotion
The motor output for walking is produced by a network of neurons termed the spinal central pattern generator (CPG) for locomotion. The basic building block of this CPG is a half-center oscillator composed of two mutually inhibitory sets of interneurons, each controlling one of the two dominant phases of locomotion: flexion and extension. To investigate symmetry between the two components of thi...
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ژورنال
عنوان ژورنال: The Journal of Physiology
سال: 1995
ISSN: 0022-3751
DOI: 10.1113/jphysiol.1995.sp020897