The Circle of Willis
Yes, an alien made out of arteries.

Quick Notes of Explanation:
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anterior cerebral - brain
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anterior communicating - alien antenna
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opthalmic - eye
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internal carotid - heart (in place of nose)
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anterior choroidal - ears (listening to chorus)
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posterior communicating - mouth
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posterior cerebral - involves cerebrum so learning and school books
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superior cerebellar - cerebellum involved in balance so a cane
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pontine - pointy, located kind of as ribs
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basillar - like a basil plant or something, the vis!
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anterior inferior cerebellar - lower so maybe a tutu because again cerebellum involved in balance so maybe dance
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vertebra and anterior spinal - squares representing vertebra, sorry ran out of ideas
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posterior inferior cerebellar - again balance so put shoes on cause walking requires balance too