Question

MOTOR SYSTEM

*What are the 2 pathways that the brain uses to control movement?
*What is the sequence of cortex activity that controls planning and execution of movement?
*What is the motor homonculus?
*How does the concept of disinhibition work in the basal ganglia?
*What are the symptoms, cause, and treatments for Huntington's Disease?
*What are the symptoms, cause, and treatments for Parkinson's Disease?

Answer 1

(Since you have posted multiple questions, I am going to answer first three. I hope it helps, Thanks )

1. The motor system and primary motor cortex.

2. The brain’s motor system is present in the frontal lobes. It starts with premotor areas, for planning and coordinating complex movements, and ends with the primary motor cortex, where the final output is sent down the spinal cord to cause contraction and movement of specific muscles.

3. A motor homunculus is a distorted representation of the human body. It is based on a neurological map of the areas and proportions of the brain dedicated to processing motor functions, or sensory functions.