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Answer :
Final answer:
Rachel furrowing her eyebrows involves the corticobulbar tract, which is a subdivision of the corticospinal pathway that controls facial muscles.
Explanation:
The motor pathway being described in the scenario where Rachel is mad and furrows her eyebrows is likely the corticobulbar tract. This tract is part of the corticospinal pathway and is responsible for controlling the muscles of facial expression, such as furrowing the eyebrows. The axons of the corticobulbar tract are ipsilateral, which means they project from the cortex to the motor nucleus on the same side of the nervous system.
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