NP11 Motor Control: Cerebellum and Basal Ganglia

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16 Terms

1
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Vestibulocerebellum - Input:

From vestibular nuclei

  • posture, body movement, proprioceptive info

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Vestibulocerebellum - Output:

To vestibular nuclei & reticular information

  • control muscles of trunk, shoulders, neck, & proximal muscles of limbs

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Vestibulocerebellum - Regulation (Main function):

Control posture, equilibrium, and muscle tone

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Vestibulocerebellum includes:

  • Flucculonodular lobe & adjacent vermis

  • And Fastigial nucleus (b/c vermis sends projections projections to fastigial nucleus)

<ul><li><p><strong>Flucculonodular</strong> lobe &amp; adjacent <strong>vermis</strong></p></li><li><p>And <strong>Fastigial nucleus</strong> (b/c vermis sends projections projections to fastigial nucleus)</p></li></ul><p></p>
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Spinocerebellum - Input:

Spinocerebellar tract from muscles & tendons

  • Info about status of muscle contraction, muscle force, proprioceptive info

  • Axons from muscle spindle circuits & Golgi tendon organ circuits descend to CNS, and some travel to spinocerebellum

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Spinocerebellum - Output:

Via lateral corticospinal (through VL thalamus), rubrospinal (red nucleus), Reticulospinal, & Vestibulospinal tracts to the body muscles

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Spinocerebellum - Regulation (Main function):

Body & limb movements

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Spinocerebelllum includes:

  • most of vermis & paravermal zone

  • 2 nuclei are part of this circuitry

    • Fastigial nucleus (Vermis → Fastigial n.)

    • Interposed nucleus (Paravermal zone → Interposed n.)

<ul><li><p><strong>most of vermis</strong> &amp; <strong>paravermal zone</strong></p></li><li><p>2 nuclei are part of this circuitry</p><ul><li><p>Fastigial nucleus (Vermis → Fastigial n.)</p></li><li><p>Interposed nucleus (Paravermal zone → Interposed n.)</p></li></ul></li></ul><p></p>
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How many groups of deep cerebellar nuclei?

  1. Vermis → Fastigial nucleus

  2. Paravermal zone → Interposed nucleus

  3. Lateral zone → Dentate nucleus

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Fastigial nucleus

Receives projections from the Vermis

*Vermis → Fastigial n.

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Interposed nucleus

Receives projections from the Paravermal zone

*Paravermal zone → Interposed n.

  • Interposed n. = Globose n. (Posterior) + Emboliform n. (Anterior)

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Dentate Nucleus

Receives projections from Lateral zone

*Lateral zone → Dentate n.

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Cerebrocerebellum - Input:

From cerebral cortex through the Pontine Nuclei (pons)

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Cerebrocerebellum - Output:

  1. Through the VL of thalamus to the cerebral cortex

  2. Then via lateral corticospinal tracts to the muscles of arms & legs

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Cerebrocerebellum - Regulation (Main function):

Planning, initiation, & timing of highly skilled movements, complex movements

  • Mainly hand & forearm

  • Ex:

    • throwing a ball

    • Playing musical instrument (like violin & guitar)

<p>Planning, initiation, &amp; timing of highly skilled movements, complex movements </p><ul><li><p>Mainly hand &amp; forearm</p></li></ul><ul><li><p>Ex: </p><ul><li><p>throwing a ball </p></li><li><p>Playing musical instrument (like violin &amp; guitar)</p></li></ul></li></ul><p></p>
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Cerebrocerebellum includes:

Dentate nucleus & projections from the lateral zone

*Lateral zone → Dentate n.

<p>Dentate nucleus &amp; projections from the lateral zone</p><p>*Lateral zone → Dentate n.</p>