[Verse 1] Five layers deep before you touch the bone, Skin, connective tissue, galea holds the throne, Loose areolar space — your surgical highway, Then pericranium anchored all the way, Emissary veins tunnelling scalp to sinus, Carry infection inward — nature's bias, The galea takes the tension, bears the strain, Close it strong or scars will bloom again Superficial temporal artery tracing back To the preauricular groove, that's your landmark track, Interfascial plane protects the facial nerve, The frontotemporal branch — respect that curve, Supraorbital notch or foramen, feel the groove, Supratrochlear bundled medial, find your groove, Every flap you cut must honour blood supply, Pedicled and purposeful — or tissues die [Chorus] Cribriform carries one — the olfactory thread, Optic canal carries two, and the ophthalmic head, Three, four, six and V-one through superior orbital fissure, V-two rotundum, V-three ovale — memorise the scripture, Spinosum carries middle meningeal in, Lacerum holds the carotid — no nerve exits within, Jugular foramen: nine, ten, eleven and the vein, Twelve through the hypoglossal — recite it like a refrain [Verse 2] Pterion marks the meeting of four bones, A paper-thin veneer that fracture groans, Beneath it, middle meningeal ascending, A lens-shaped haematoma quickly pending, Bregma, lambda, asterion, inion, Kocher's point for ventricle precision, Frazier's point for posterior, Dandy's for the drain, MacCarty's keyhole anchors every pterional plane The petrous ridge divides the middle from the posterior, Clivus slopes to the foramen — basal, basilar, Internal auditory canal: seven and eight, Bill's bar divides the facial nerve from its cochlear mate, Geniculate ganglion, frequently dehiscent — bare and thin, Greater superficial petrosal nerve branching within, Labyrinthine, tympanic, mastoid — facial nerve descends, Stylomastoid foramen where its bony journey ends [Chorus] Cribriform carries one — the olfactory thread, Optic canal carries two, and the ophthalmic head, Three, four, six and V-one through superior orbital fissure, V-two rotundum, V-three ovale — memorise the scripture, Spinosum carries middle meningeal in, Lacerum holds the carotid — no nerve exits within, Jugular foramen: nine, ten, eleven and the vein, Twelve through the hypoglossal — recite it like a refrain [Bridge] The sphenoid sinus pneumatises three ways — presellar, sellar, conchal, Opticocarotid recess is your endoscopic oracle, Nasoseptal flap — pedicled on sphenopalatine, A vascularised obsidian curtain, sealing the midline, Dura mater, arachnoid, pia — three meningeal strata, Falx and tentorium fold, a rigid armatura, Bridging veins traverse the subdural corridor — Lacerate them and the blood will pool before the door
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