What controls humans' ability to perform very skilled movements such as writing?

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Corticospinal fibers mediate voluntary movement, particularly very skilled, discrete, and purposeful movements, such as writing. The corticospinal tract, also known as the pyramidal tract, is a newer, "higher" motor system that humans have that permits very skilled and purposeful movements. The other responses are not r/t skilled movements. The basal ganglia are large bands of gray matter buried deep within the two cerebral hemispheres that from the subcortical-associated motor system and help to initiate and coordinate movement and control automatic associated movements of the body (e.g. arm swing alternating with the legs during walking). The spinothalamic tract is one of the major sensory pathways of the CNS and has two parts. The lateral spinothalamic tract carries pain and temperature sensations and the anterior spinothalamic tract carries crude touch. The extrapyramidal tracts include all the motor nerve fibers originating in the motor cortex, basal ganglia, brainstem, and spinal cord that are outside the pyramidal tract and maintains muscle tone and control body movements, especially gross automatic movements such as walking.

What Controls Humans' Ability to Perform Very Skilled Movements Such