Abstract
Neural projections from the extensor carpi radialis longus (ECRL) muscle to the ipsilateral biceps brachii (BB) motoneurons were studied in 10 healthy human subjects using a post-stimulus time histogram, in which a conditioning stimulus was triggered by the BB motor-unit discharge. Out of 100 BB motor units, electrical stimulation to the ECRL nerve using intramuscular needle electrodes induced inhibition in 15 units (15%) and facilitation in 10 units (10%). Both inhibition and facilitation were also evoked at intensities well below the motor threshold. As a reference for latency, a monosynaptic Ia facilitation was also induced in the BB in each subject by stimulating the median nerve trunk using surface electrodes at the distal end of the medial intermuscular septum of the arm. Compared to this latency, the evoked modulations by ECRL nerve stimulation were regarded as projections of mono- or di-synaptic connections.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
