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Physiology

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Central Nervous System

Question
3 out of 20
 

Function of spinocerebellar tract (AIIMS MAY 2009)



A Planning & programming of movement

B Coordination & smoothing of movement

C Equilibrium

D Vibration

Ans. B Coordination & smoothing of movement.

Function of Principal Afferent Systems to the Cerebellum.

Afferent Tracts

Transmits

Vestibulocerebellar

Vestibular impulses from labyrinths, direct and via vestibular nuclei

Dorsal spinocerebellar

Unconscious Proprioceptive and exteroceptive impulses from body

Ventral spinocerebellar

Unconscious Proprioceptive and exteroceptive impulses from body

Cuneocerebellar

Proprioceptive impulses, especially from head and neck

Tectocerebellar

Auditory and visual impulses via inferior and superior colliculi

Pontocerebellar

Impulses from motor and other parts of cerebral cortex via pontine nuclei

Olivocerebellar

Proprioceptive input from whole body via relay in inferior olive

a. The kinesthetic & proprioceptive information from the body relayed via spinocerebellar tracts are used for coordinationQ.

b. The copy of motor plan relayed from motor cortex via pontocerebellar tract is matched with the actual muscle movements information relayed via spinocerebellar tract (Comparator Servo Mechanism).Then prompt correction are made to coordinate and smoothen the ongoing activity.

c. The information does not reach the Somatosensory cortex so it is unconscious kinesthetic & proprioceptive sensationQ.

d. It reaches the cerebellar cortex as Mossy fibresQ which excite the granule cellsQ.

e. Dorsal spinocerebellar is uncrossed Qand reaches cerebellum via inferior peduncleQ.

f. Ventral spinocerebellar is mostly crossedQ and reaches cerebellum via superior peduncleQ.

Central Nervous System Flashcard List

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