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Functional specialization within the cat red nucleus.

K M Horn1, M Pong, S R Batni

  • 1Division of Neurobiology, Barrow Neurological Institute, St. Joseph's Hospital and Medical Center, Phoenix, Arizona 85013, USA. khorn@chw.edu

Journal of Neurophysiology
|January 11, 2002
PubMed
Summary
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The red nucleus (RN) has two divisions, magnocellular (RNm) and parvicellular (RNp), that influence different cat forelimb muscles during reaching. Fiber stimulation confirmed RNm targets digit/wrist muscles, while RNp targets shoulder muscles, matching their spinal projections.

Area of Science:

  • Neuroscience
  • Motor Control
  • Spinal Cord Physiology

Background:

  • The red nucleus (RN) in cats has magnocellular (RNm) and parvicellular (RNp) divisions projecting to the cervical spinal cord.
  • RNp targets upper cervical levels, RNm targets lower levels, suggesting differential muscle influence during reaching and grasping.
  • Rubrospinal tract terminations primarily target interneurons, complicating direct functional interpretation of RN divisions based on spinal projections alone.

Purpose of the Study:

  • To investigate functional differences between the RNm and RNp divisions of the cat red nucleus.
  • To determine if selective stimulation of RNm and RNp, and their efferent fibers, elicits distinct motor responses in the forelimb during reaching.
  • To correlate the physiological actions of RNm and RNp with their known spinal termination patterns.

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Main Methods:

  • Selective electrical stimulation of the RNm and RNp, as well as their efferent fibers, in cats.
  • Recording electromyographic (EMG) activity from seven forelimb muscles during reaching tasks.
  • Averaging EMG activity over thousands of stimuli to identify facilitation or suppression patterns post-stimulation.

Main Results:

  • Stimulation within the RN resulted in complex facilitation and suppression patterns, with the digit dorsiflexor (extensor digitorum communis) often facilitated.
  • Stimulation of RNp efferent fibers preferentially facilitated shoulder muscles (spinodeltoideus, supraspinatus).
  • Stimulation of RNm efferent fibers preferentially facilitated digit and wrist muscles (extensor digitorum communis, palmaris longus, extensor carpi ulnaris).

Conclusions:

  • The distinct muscle facilitation patterns resulting from RNm and RNp fiber stimulation align with their respective spinal termination levels.
  • These findings support a functional differentiation between the RNm and RNp divisions in controlling specific forelimb musculature.
  • The complex effects observed from stimulating within the RN suggest intricate synaptic interactions within the nucleus itself.