Microcircuitry and function of the inferior olive

Area of Science:

• Neuroscience
• Cerebellar Function
• Motor Control

Background:

• The inferior olive projects climbing fibers to cerebellar Purkinje cells.
• Its role in motor learning, timing, and movement comparison is debated.
• Olivocerebellar circuitry involves unique glomeruli with combined inputs.

Purpose of the Study:

• To review the function of the inferior olive based on its microcircuitry.
• To propose a model for olivocerebellar function.
• To clarify the role of the inferior olive in motor control.

Main Methods:

• Review of existing literature on inferior olive structure and function.
• Analysis of the microcircuitry of the olivary neuropil, including glomeruli.
• Comparison with computational models (Segev and Rall) of neuronal function.

Main Results:

• The inferior olive's microcircuitry, with its glomeruli, supports combined excitatory and inhibitory inputs.
• Dendritic spines are coupled by gap junctions, suggesting network interactions.
• A computational model suggests applicability to olivary spine morphology and input.

Conclusions:

• The microcircuitry of the inferior olive is capable of motor learning and motor timing.
• The inferior olive does not directly compare intended with achieved movements.
• Olivocerebellar function is best understood through its unique microcircuit architecture.