[Verse 1] Ten percent of the volume, tucked low in the back, yet it hoards half your neurons — a crowded little shack. Granule cells packed tight like seeds in a jar, a galaxy of dust where the real numbers are. Le petit cerveau, they whisper in Paris, a little brain, mozochok, no need to be wary — size isn't power, it's density that wins, this wrinkled little walnut's where the real math begins. [Chorus] Le petit cerveau, mozochok calling your name, little brain, little brain, counting every aim, mossy fibers in, parallel fibers spread, Purkinje says non, non — quiet in your head. Le petit cerveau, mozochok, steady and true, balance, limbs, and reaching — it's watching over you. [Verse 2] Mossy fibers carry whispers up from the spine, granule cells relay them along the parallel line, they reach out and tickle a thousand Purkinje trees, while one climbing fiber from the inferior olive sees— wraps around a single Purkinje, tight like a vine, shouting one loud lesson, a teaching signal, divine. Purkinje cells answer only in GABA's low moan, inhibiting deep nuclei, the cortex's lone throne. [Verse 3] Three provinces live inside this little brain of yours: vestibulocerebellum keeps your eyes on their course, balance and gaze steady, the inner ear's old friend, spinocerebellum tunes the limbs end to end. Cerebrocerebellum dials the cortex up above, through dentate nucleus and VL thalamus, love, whispering to M1 and premotor down the hall, planning every reach before you move at all. [Verse 4] Hurt the right side, the right side will fail — ipsilateral trouble, same-side telltale. Ataxia makes your walking a wobbling weave, dysmetria's a miss, past or short — hard to believe you aimed for the cup but you topple the shelf, intention tremor shakes when you reach for yourself, dysdiadochokinesia — can't flip your hand fast, the rhythm of quick turns is a skill that won't last. [Bridge] Inside the arbor vitae, the tree of life in white, branches of fibers folded, hidden out of sight — not just a balance-keeper, not just old reflex and bone, it's building inner models, a world it calls its own. Adaptation's coming, Part Eight will reveal, how climbing fibers teach it to rewrite how you feel. [Chorus] Le petit cerveau, mozochok calling your name, little brain, little brain, counting every aim, mossy fibers in, parallel fibers spread, Purkinje says non, non — quiet in your head. Le petit cerveau, mozochok, steady and true, balance, limbs, and reaching — it's watching over you. [Outro] Mozochok, le petit cerveau, little brain so dense, half the neurons, one-tenth space — now it all makes sense.
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