Final answer:
Lesions in the right cerebellar hemisphere lead to ataxia, characterized by a lack of coordination, balance issues, gait alterations, tremors, and impaired motor responses like the rebound effect, due to disturbed processing of spinal and cerebral inputs.
Step-by-step explanation:
Symptoms of a lesion in the right cerebellar hemisphere can present as various forms of ataxia, which is a movement disorder characterized by a loss of coordination in voluntary movements. This reflects in difficulties with maintaining balance, gait and station alterations, possibly due to a disruption of proprioceptive input that the right hemisphere receives, and integrates for motor control.
The right cerebellar hemisphere is responsible for coordinating movements on the same side of the body, working in tandem with the brain's other structures, such as the vermis, which is the prominent ridge along the midline of the cerebellum also known as the spinocerebellum.
Key tests to assess the integrity of the right cerebellar hemisphere include checking for the presence of tremors when the patient extends their arms, and the rebound response to perturbations.