Can anyone give me a simple explanation on what part of the brain would be related to hypertonia in a child?

Pyramidal pathway: Hi, Hypertonia is a symptom of a neurological condition. It is thought to be a problem not so much in a specific area, but in a pathway of nerves that starts in the motor cortex of the brain and runs through the brainstem to the spinal cord. The pyramidal and extrapyramidal pathways are the 'interstates' that these nerves run through. It can be a challenge in children to determine the cause.