[Verse 1]
The septum's not one flat wall standing lonely and plain,
It's stitched from four separate quarters, each with its own domain.
Aortic valve sits above it, tricuspid leans in tight,
Below them lives the thinnest patch, the fibrous membranous site.
[Chorus]
Membranous, inlet, trabecular, outlet —
four little walls, and none you should forget it.
M-I-T-O, cuatro partes, no es mito,
cada defeito leva o nome da parte partida.
Say it soft, say it true, mi amor, escuta bem,
the hole is named for what's missing, not for what remains.
[Verse 2]
Membranous first — small, fibrous, tucked below the aortic door,
neighbor to the tricuspid's septal leaflet, nothing more.
Thin as parchment, easy prey for a gap to breed and grow,
the single most common address where a VSD will show.
[Verse 3]
Travel down and inward, past the valves that guard the flow,
inlet septum's muscle bridges where the AV rings sit low.
Mitral on the left, tricuspid holds the right-hand lane,
this thick partition keeps the inflows running in their own domain.
[Chorus]
Membranous, inlet, trabecular, outlet —
four little walls, and none you should forget it.
M-I-T-O, cuatro partes, no es mito,
cada defeito leva o nome da parte partida.
[Verse 4]
Now the belly of the heart, the trabecular expanse,
central, apical, the biggest muscle in the dance.
Trabeculated — ridged with bundles, rough and bark-like, wide,
heavier still and craggier along the right-hand side.
[Verse 5]
Below the aortic and pulmonic gates, the outlet takes its stand,
infundibulum — a funnel-shaped, conal strip of land.
Born from the twisting conotruncus, splitting one tube in two,
outflow beneath outflow, a muscular usher guiding blood on through.
[Verse 6]
Clinically speaking, size and place decide the tale they tell —
a small perimembranous gap may close and heal itself.
But muscular ones can multiply, like Swiss cheese, hard to trace,
while outlet defects invite the aorta to override its place.
Listen for the murmur, holosystolic, loud and coarse,
each location whispers its own hemodynamic force.
[Bridge]
So when you name the hole, don't guess, don't spin the wheel —
find the wall that's absent, that's the name you reveal.
Membranous, inlet, trabecular, outlet — cuatro caminos,
cada nombre cuenta dónde el corazón perdió su destino.
[Chorus]
Membranous, inlet, trabecular, outlet —
four little walls, and none you should forget it.
M-I-T-O, cuatro partes, no es mito,
cada defeito leva o nome da parte partida.
[Outro]
Four components, one septum, dividing the tide,
M-I-T-O, não é mito — carry the map inside.
Membranous, inlet, trabecular, outlet — say it slow, say it clear,
now you hold the heart's four rooms, the whole wall drawn right here.