Genevieve often feels as though she is going to fall over while walking. her doctor diagnosis a tumor in her

Her doctor diagnosis a tumor in her cerebellum.

Cerebellum is part of the central nervous system (CNS) located posterior with the function in motor control (balance and coordination of muscles and the body). It is essential for voluntary tasks such as walking, being able to stay balanced and upright. So imprroper function of this part of the brain will lead to struggling with maintaining proper muscle coordination.

The answer is cerebrum.

Cerebrum is the principal and most anterior part of the brain in vertebrates, located in the front area of the skull and consisting of two hemispheres, left and right, separated by a fissure. It is responsible for the integration of complex sensory and neural functions and the initiation and coordination of voluntary activity in the body.