Evidence against a Common Excitatory Drive to Motoneurons Innervating Bifunctional and Single Joint Muscles during Fictive
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منابع مشابه
Pattern generators for muscles crossing more than one joint.
The activation pattern of many hindlimb flexor and extensor motoneurons (MNs) in walking can be described as simple: a single burst of spikes in the appropriate phase of walking. However, in muscles which cross more than one joint (here called bifunctional muscles), the activation pattern is complex, consisting of activity during both the flexion and extension phases. The neural origin of the c...
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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Reflex responses of hypoglossal motoneurons innervating the geniohyoid (GH) and thyrohyoid (TH) muscles from the superior laryngeal (SLN) and vestibular nerves and their behaviors during fictive swallowing and vomiting were examined by recording both the extracellular activities of 11 single cells in the hypoglossal nucleus and GH and TH muscle nerve activity in eight decerebrate, paralyzed, an...
متن کاملModeling the Organization of Spinal Cord Neural Circuits Controlling Two-Joint Muscles
The activity of most motoneurons controlling one-joint muscles during locomotion are locked to either extensor or flexor phase of locomotion. In contrast, bifunctional motoneurons, controlling two-joint muscles such as posterior biceps femoris and semitendinosus (PBSt) or rectus femoris (RF), express a variety of activity patterns including firing bursts during both locomotor phases, which may ...
متن کاملMotoneuronal and muscle synergies involved in cat hindlimb control during fictive and real locomotion: a comparison study.
We compared the activity profiles and synergies of spinal motoneurons recorded during fictive locomotion evoked in immobilized decerebrate cat preparations by midbrain stimulation to the activity profiles and synergies of the corresponding hindlimb muscles obtained during forward level walking in cats. The fictive locomotion data were collected in the Spinal Cord Research Centre, University of ...
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تاریخ انتشار 2003