The input and output pathways of cerebellum

 

2. Input Pathways

• Mossy Fibers: Origin: Brainstem (pontine nuclei), spinal cord, vestibular system.  they carry general sensory/motor information, synapse with granule cells.
• Climbing Fibers: Originate from  Inferior olivary nucleus. it responsible for motor learning feedback, synapse with Purkinje cells.

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3. Output Pathways

• Deep Cerebellar Nuclei (DCN):
• Structures: Dentate, interposed, fastigial nuclei. (collection of nerve cell body within the white matter of cerebellum) 
• Function: they relay motor/posture/balance signals to motor pathways.
• Motor Pathways:
• Thalamus: Sends motor informatio in to motor cortex.
• Brainstem: it controls posture, balance, and limb movements.

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4. Cerebellar Circuits

• Corticopontocerebellar Pathway: it sends motor commands from the motor cortex to cerebellum for movement coordination.
• Spinocerebellar Pathways: it provide proprioceptive feedback to adjust posture and movement.
• Olivocerebellar Pathway: it sends error-correcting feedback for motor learning.