[Quantitative analysis of the distribution of the cortical motor representation of forelimb and hindlimb areas in cat nucleus ruber].
Quantitative analysis of the corticorubral fibers distribution was performed after point electrolytic destruction of lateral and medial borders of posterior sigmoid gyrus, which are the motor representations of the forelimb and hindlimb areas in the nucleus ruber of the cat. It was shown that the cortical representation area of the forelimbs projected to the whole rostro - caudal extension of the nucleus ruber. Number of efferent fibers terminating in rostral border of nucleus ruber, was almost two times grater than that in the caudal third. The efferent fibers of the hindlimb area were found not to project to the rostral two thirds of nucleus ruber, and were found to terminate only in its caudal third. The quantity of these projecting corticorubral fibers is equal to that projecting from cortical representation of the forelimbs to caudal third of nucleus ruber. The significant (almost two-fold) prevalence of the number of the fibers projecting from cortical representation of the forelimbs over that projecting from cortical representation of the hindlimbs, found in this study, may suggest greater functional significance of corticorubral connections for the motor reactions realized by the forelimbs.
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D000818:Animals; D002415:Cats; D005552:Forelimb / Q000294:innervation*; D006614:Hindlimb / Q000294:innervation*; D009044:Motor Cortex / Q000648:ultrastructure*; D012012:Red Nucleus / Q000648:ultrastructure*