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Questions and Answers
What type of cells are involved in transmitting information from proprioceptors in the first neuron?
Where do the axons of the second neuron pass through to reach the cerebellum?
Which tracts run ipsilaterally in the spinal cord?
Where do the neurons of the anterior spinocerebellar tract terminate?
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What type of proprioception is transmitted through the neuronal pathways mentioned in the text?
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Which nucleus is involved in the cuneocerebellar tract?
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Study Notes
Neuronal Pathways for Unconscious Proprioception
- Transmit unconscious proprioception through lateral funiculus of spinal cord
Anterior and Posterior Spinocerebellar Tracts
- Originate from lower limb (LL) and lower part of trunk
- Terminate in ipsilateral cortex of cerebellum (palliocerebellum – spinal cerebellum)
Cuneocerebellar Tract
- Originate from upper limb (UL) and upper part of trunk
- Terminate in ipsilateral cortex of cerebellum (palliocerebellum – spinal cerebellum)
First-Order Neurons
- Pseudounipolar cells in spinal ganglion
- Dendrites transmit information from tendon, muscle, and joint proprioceptors
- Axons continue to posterior horn of spinal cord
Second-Order Neurons
- Located in ipsilateral thoracic nucleus (Stilling-Clarke) of posterior horn (spinocerebellar tracts)
- Or located in accessory cuneate nucleus (cuneocerebellar tract)
- Axons pass through superior cerebellar peduncles (anterior spinocerebellar tract) or inferior cerebellar peduncles (posterior spinocerebellar and cuneocerebellar tracts) to cortex of cerebellum
Characteristics of Spinocerebellar and Cuneocerebellar Tracts
- Posterior spinocerebellar and cuneocerebellar tracts run ipsilaterally (do not cross over)
- Anterior spinocerebellar tract runs contralaterally in spinal cord and crosses over again, terminating in ipsilateral cerebellar cortex
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Description
This quiz covers the pathways of unconscious proprioception, including the lateral funiculus of the spinal cord, anterior and posterior spinocerebellar tracts, and the cuneocerebellar tract.
