[Verse 1] Three floors stacked inside the skull's apartment block — Midbrain up top, then pons, then medulla on the dock. Cerebral peduncles carry corticospinal weight, Substantia nigra dopamine, red nucleus calibrate. Superior and inferior colliculi, four bumps on the plate, Periaqueductal gray wraps the aqueduct — the gate. Basis pontis anterior, tegmentum at the rear, Middle cerebellar peduncle bridging hemisphere to hemisphere. Pyramids cross below, the olives bulge beside, Rule of four: four structures per level — use it as your guide. [Chorus] Le tronc cérébral, connais chaque zone — Weber, Benedikt, Wallenberg, Dejerine, don't leave them alone. Entra solo dove è sicuro, mappa il pavimento — Safe zones, fourth ventricle floor, medial sulcus — ogni momento. Corticospinal descends, lemniscus climbs the spine, Conscious but without movement — cross each tract, locate the line. [Verse 2] Weber involves CN three then drops the motor tract — Ipsilateral eye ptosis, contralateral weakness stacked. Benedikt adds the red nucleus: tremor, ataxia's call. Claude gives you Horner's too — one midbrain, syndromes wall to wall. Foville and Raymond haunt the pons with abducens tied, Millard–Gubler draws the facial nerve along for the ride. Lateral medullary — Wallenberg, the dizzy spinning spell: Dysphagia, Horner's, hemisensory loss — the classic tale to tell. Dejerine goes medial: tongue deviates, the hand goes weak, Internuclear ophthalmoplegia — MLF is what you seek. [Chorus] Le tronc cérébral, connais chaque zone — Weber, Benedikt, Wallenberg, Dejerine, don't leave them alone. Entra solo dove è sicuro, mappa il pavimento — Safe zones, fourth ventricle floor, medial sulcus — ogni momento. Corticospinal descends, lemniscus climbs the spine, Conscious but without movement — cross each tract, locate the line. [Verse 3] Now map the fourth ventricle floor before your approach descends — Facial colliculus bulges where CN seven bends. Striae medullares stripe across the midpoint ridge, Hypoglossal trigone lateral, vagal trigone bridge. The obex marks the calamus — tip of the quill below. Safe entry: suprafacial, infrafacial — surgeon, take it slow. Peritrigeminal corridor, olivary and postolivary zone, Lateral mesencephalic sulcus — always map before your own. Supracollicular, infracollicular — plan before you go, Arousal runs reticular — disrupt it and coma grows. [Bridge] Parinaud regarde en haut mais ne peut plus — The tectum pressed, upgaze arrested, pupils fixed askew. One-and-a-half: one gaze palsy plus internuclear too, The pontine gaze center fractured — bilateral conjugate's through. Cranial nerves one through twelve each carry nucleus, foramen, name — Every exit, every function, every level not the same. Olfactory, optic, oculomotor lead the count, Trochlear exits dorsally — the only one to come around. Trigeminal, abducens, facial, vestibulocochlear line, Glossopharyngeal, vagal, accessory, hypoglossal — all the way to nine.
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