[Verse 1] Left main splits like a fork in a creek, LAD runs the front, that's the wall that speaks — septum and the pump, the muscle's engine bay, circumflex wraps round, takes the lateral away. Links, mein Freund, versorgt die Vorderwand, zwei Äste, zwei Wege, fest in meiner Hand. Anterior descending feeds the septum's core, circumflex kisses the side, then it's looking for more. [Chorus] Links und rechts, zwei Kronen im Kreis, left feeds front, right keeps the bottom warm — weiß? Sinus zündet, AV hält den Schritt, His trägt den Strom durch die Wand mit. Left, right, front, and floor — coronary crown, that's the anatomy lore. [Verse 2] Right coronary, quiet worker, unsung role, feeds the free wall of the right ventricle, that's the goal. Ninety percent of the time, it's the boss of below — inferior wall, and it feeds the AV node, ja, so. Rechte Krone, sie versorgt das, was man vergisst, aber wenn sie blockiert, dann ist der Rhythmus im Riss. Occlude the right, and the bottom wall turns pale, the node loses power — heart block, follow the trail. [Chorus] Links und rechts, zwei Kronen im Kreis, left feeds front, right keeps the bottom warm — weiß? Sinus zündet, AV hält den Schritt, His trägt den Strom durch die Wand mit. Left, right, front, and floor — coronary crown, that's the anatomy lore. [Verse 3] Now the wiring — sinus node, right atrium's spark, lights the chambers up like a match struck in the dark. Travels to the AV node, slows the pulse, takes a breath, gatekeeper timing, keeps the ventricles from death. Then the Bundle of His, sneaking through the septal wall, dividing into branches, left and right, standing tall. Purkinje fibers spread it wide like ivy on a fence, squeezing the ventricles in perfect, practiced sequence. [Verse 4] Collaterals grow quiet when the vessels start to close, the heart writes its own detour, nobody knows. Dominance can shift — some hearts favor the right, some lean on the left to keep the septum bright. Balanced circulation, a rare and steady hand, posterior descending choosing where to stand. Know your anatomy, know the variant's name, every heart's a map, but never quite the same. [Bridge] Surgeon's hand, be careful where you sew — the His bundle's hidden in that septal row. Patch a VSD without a map of the line, you'll sew shut the rhythm, cut the heart's design. Durch die Wand, verborgen, zart und fein, ein falscher Stich, und der Takt bricht ein. [Chorus] Links und rechts, zwei Kronen im Kreis, left feeds front, right keeps the bottom warm — weiß? Sinus zündet, AV hält den Schritt, His trägt den Strom durch die Wand mit. Left, right, front, and floor — coronary crown, that's the anatomy lore. [Outro] Sinus, AV, His, and the branching tree, Purkinje finishes the current, silent and free. Left feeds front, right feeds floor, das Herz erzählt — und wir wissen mehr.
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