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Electromyographic studies of neck muscles in the intact cat

Short-latency reflexes were studied in the neck muscles of four alert cats following electrical stimulation of nerves supplying biventer cervicis (BC), splenius (SP) or rectus capitis posterior (RCP). Reflexes were assessed by comparing levels of EMG activity of muscles before and after each stimulus, as the cats lapped milk, licked their paws or walked on a treadmill. When BC or SP nerves were stimulated at 1.5–4 times threshold (T) for their motor axons, no short-latency heteronymous reflexes could be identified in most neck muscles. However, stimulation of RCP nerves produced inhibitory effects as early as 3–4 ms in the ipsilateral BC, CM, and SP muscles and 6 ms in contralateral BC. At stimulus strengths above 4xT, a more complex pattern of inhibitory or excitatory effects was observed in CM, SP and the intervertebral muscle spinalis dorsi. The reflex effects were attenuated or abolished by partial or complete C1 dorsal rhizotomy (2 cats). Cervicocollic reflex data may need to be reevaluated to consider the possible effects of disinhibition rather than excitation in short-latency reflex pathways.

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BC:

biventer cervicis

CM:

complexus

OCI:

obliquus capitis inferior

RCP:

rectus capitis posterior

SP:

splenius

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1. Department of Physiology and Bio-Medical Engineering Unit, Queen's University at Kingston, K7L 3N6, Canada

   F. J. R. Richmond & G. E. Loeb

1. F. J. R. Richmond
2. G. E. Loeb

Richmond, F.J.R., Loeb, G.E. Electromyographic studies of neck muscles in the intact cat. Exp Brain Res 88, 59–66 (1992). https://doi.org/10.1007/BF02259128

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• Received: 15 March 1991

• Accepted: 22 August 1991

• Issue Date: January 1992

• DOI: https://doi.org/10.1007/BF02259128

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