Accessory olivary nucleus
The accessory olivary nucleus is a collection of neuronal cell bodies located in the medulla oblongata of the brainstem. It is part of the olivary body, which also includes the inferior olivary nucleus. The accessory olivary nucleus is involved in the modulation of motor control and is connected to the cerebellum via the olivocerebellar tract.
Anatomy[edit | edit source]
The accessory olivary nucleus is divided into two main parts: the dorsal accessory olivary nucleus and the medial accessory olivary nucleus. These nuclei are situated adjacent to the inferior olivary nucleus and are involved in the processing of motor and sensory information.
Dorsal Accessory Olivary Nucleus[edit | edit source]
The dorsal accessory olivary nucleus is located dorsally to the inferior olivary nucleus. It receives input from various sources, including the spinal cord and the cerebral cortex.
Medial Accessory Olivary Nucleus[edit | edit source]
The medial accessory olivary nucleus is situated medially to the inferior olivary nucleus. It is involved in the coordination of motor activities and receives input from the red nucleus and other brainstem nuclei.
Function[edit | edit source]
The accessory olivary nucleus plays a crucial role in the coordination and timing of movements. It is part of the olivocerebellar system, which is essential for motor learning and the fine-tuning of motor actions. The neurons in the accessory olivary nucleus project to the Purkinje cells in the cerebellar cortex, influencing cerebellar output and motor coordination.
Clinical Significance[edit | edit source]
Lesions or dysfunctions in the accessory olivary nucleus can lead to motor coordination disorders, such as ataxia. Damage to this area can disrupt the normal flow of information to the cerebellum, resulting in impaired motor control and balance.
Connections[edit | edit source]
The accessory olivary nucleus receives afferent fibers from the spinal cord, cerebral cortex, and other brainstem nuclei. It sends efferent projections to the cerebellum via the olivocerebellar tract, which is crucial for the modulation of cerebellar activity.
Also see[edit | edit source]
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