[Verse 1]
Deep in the entorhinal, basement of the mind,
Layer five's the loading dock, output redefined,
CA1 sends cargo, subiculum too,
Big pyramidal bodies catching everything they threw,
Dendrites drink the signal from the hippocampal well,
This ain't the input door, no — this the outbound bell,
Memory finished baking, now it's leaving through the hall,
Layer five the efferent gate — outgoing, that's the call.
[Chorus]
Five is where it exits, five closes the loop,
CA1 to cortex, watch the circuit swoop,
Retrosplenial, prefrontal, perirhinal too,
Postrhinal catching echoes of the thought you knew,
Va sends it outward, Vb keeps it home,
Superficial layers welcome the memory back to roam,
Grid cells, head-direction, conjunctive in the mix,
Theta rocking steady while persistent firing sticks.
[Verse 2]
Split the layer open, find the A and B,
Va's the long-haul trucker, cortex-bound and free,
Riding out to prefrontal, planning what comes next,
Carrying episodic cargo dressed in neural text,
Vb stays closer, a homebody, a local friend,
Feeding back to layer two and three, where the circuit bends,
Sürmeli in twenty-fifteen mapped the wire for us,
Ohara refined the tracing — no need to make a fuss.
[Chorus]
Five is where it exits, five closes the loop,
CA1 to cortex, watch the circuit swoop,
Retrosplenial, prefrontal, perirhinal too,
Postrhinal catching echoes of the thought you knew,
Va sends it outward, Vb keeps it home,
Superficial layers welcome the memory back to roam,
Grid cells, head-direction, conjunctive in the mix,
Theta rocking steady while persistent firing sticks.
[Bridge]
Think of it like a palimpsest — a scroll rewritten still,
Old firing patterns lingering, echoes with the will,
Persistent spikes hum onward after stimulus is gone,
That's your working memory candle, burning slow till dawn.
[Verse 3]
Trace it now, the pathway, episode in flight:
Hippocampus proper fires, CA1 ignites the light,
Subiculum joins chorus, both funnel into five,
Va picks up the signal, keeps the packet alive,
Out through white matter, past the border of the cortex,
Landing soft in prefrontal, where context sorts the context,
Perirhinal and postrhinal catch a copy on the way,
Retrosplenial holds the map for another rainy day.
[Verse 4]
Loop ain't finished, superficial layers wait,
Layer five whispers back through two and three the update,
Closing the circuit like a snake that bites its tail,
Cortex, hippocampus, cortex — riding the same rail,
Grid cells hexagon the space, head-direction spins the dial,
Conjunctive cells combine them in a single, tighter file,
Theta rhythm keeps the tempo, four to twelve a second beat,
Layer five the courier that never misses its retreat.