Final answer:
The term to describe the inability to carry out a skilled movement is apraxia. It is caused by damage to the brain that affects motor planning. Ataxia involves coordination issues due to cerebellar damage, while apraxia is not due to incoordination but the inability to plan motor tasks.
Step-by-step explanation:
The term used to describe the inability to execute or carry out a skilled movement is apraxia. Apraxia is a motor disorder caused by damage to the brain (specifically the parietal lobe) in which someone has difficulty with the motor planning to perform tasks or movements when asked, provided that the request or command is understood and the individual is willing to perform the task. The issue is not due to weakness, incoordination, sensory loss, or failure to comprehend simple commands. In contrast, ataxia refers to a lack of coordination in voluntary movements often due to cerebellar damage, leading to balance problems and a difficulty in controlling the body's voluntary movements.
Motor skills are the skills we use to move and manipulate objects. They are divided into fine motor skills and gross motor skills, with fine motor skills involving smaller movements like writing or grasping objects with our fingers, and gross motor skills involving larger body movements like running or jumping.
When it comes to disorders in motor control due to medication, regions of the nervous system such as the cerebellum and the basal ganglia are often the focus, as they are critical in coordinating fine and gross motor movements.