[Verse 1] Seven segments, C1 through C7, Bouthillier mapped the carotid all the way to heaven— Cervical, petrous, lacerum in the base, Cavernous and clinoid holding cavernous space, Ophthalmic segment, then communicating last, Meningohypophyseal trunk branching off the cavernous past, Inferolateral trunk, vidian, caroticotympanic too, Superior hypophyseal feeds the stalk right through [Chorus] Anterior choroidal — don't you clip it wrong, Hemiplegia, hemianesthesia, hemianopia — that's the triple-threat song, Heubner's recurrent, running back toward M1, Percheron's a single trunk, bilateral thalami done, Circle of Willis — complete in the minority, Fetal PCA, trigeminal — persistent circuitry [Verse 2] A1 carries medial lenticulostriates in tow, Anterior communicating — variants steal the show, Azygos ACA, a single trunk that splits the two, Bilateral infarct means the legs forget what legs should do, A2 bends around the genu, pericallosal rides the roof, Callosomarginal branches — orbitofrontal proof, Frontopolar creeps along the medial wall, Every branch a territory, map them all [Chorus] Anterior choroidal — don't you clip it wrong, Hemiplegia, hemianesthesia, hemianopia — that's the triple-threat song, Heubner's recurrent, running back toward M1, Percheron's a single trunk, bilateral thalami done, Circle of Willis — complete in the minority, Fetal PCA, trigeminal — persistent circuitry [Verse 3] M1 throws lateral lenticulostriates wide, Bifurcation, trifurcation — surgeons check inside, M2 buried in the insula's folded crease, M3 opercular, M4 where the convexity's released, Early frontal branch can fool you at the neck, Duplicated MCA — always double-check, Vertebrals converge at the pontomedullary fold, V1 through V4 — anterior spinal artery cold [Bridge] PICA rising off the vertebral, sometimes born outside the dura, AICA hugging seven, eight — labyrinthine runs through the apertura, SCA beneath the tentorium, kissing oculomotor nerve, Basilar apex perforators — that's the anatomist's reserve, P1 thalamoperforators, Percheron's unpaired stem, Thalamogeniculate, posterior choroidal — lateral and medial hem, Calcarine and parieto-occipital paint the visual cortex whole, Fetal PCA makes the posterior communicating bold [Chorus] Anterior choroidal — don't you clip it wrong, Hemiplegia, hemianesthesia, hemianopia — that's the triple-threat song, Heubner's recurrent, running back toward M1, Percheron's a single trunk, bilateral thalami done, Circle of Willis — complete in the minority, Fetal PCA, trigeminal — persistent circuitry [Outro] Persistent trigeminal — most common of the fetal ghosts, Hypoglossal, otic, proatlantal haunt their respective posts, Every sacrifice needs a map before the clip descends, Reconstruct the whole circle — that's where this module ends
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