[Verse 1] Picture the temporal lobe folded like a map you can't unfold, Neocortex six floors deep, standard architecture, tidy and cold, Hippocampus strips it bare — three thin layers, primal and old, That's allocortex, ancient tissue, the vault where memory's stored and told, Periallocortex sits between, neither six nor three, A transition ribbon thinning out, the border you gotta see, Cortex versus hippocampus ain't a fight, it's a gradient scene, Layer count is the compass — follow it, know where you've been. [Chorus] Peri, Post, Para — ring the hippocampal gate, Twenty-eight, thirty-four, transentorhinal slate, Rat brain, monkey brain, human brain don't match up straight, Read the region not the label, or you'll misread the data. [Verse 2] Parahippocampal region, four boroughs on the block, Perirhinal out front, catching objects like a dock, Postrhinal — parahippocampal in the primate tongue — Handles scenes and space, where the visual maps get strung, Entorhinal cortex, the gatekeeper, the toll, Pre- and parasubiculum flanking, playing their role, Feeding into hippocampus, funneling the flow, Cortical whispers turned to memory — that's the info's road. [Verse 3] Brodmann drew the borders back in nineteen-oh-nine, Area twenty-eight is entorhinal, caudal to rostral, a defined line, Thirty-four's the uncal patch, tucked medial and small, Between them lies the transentorhinal — the corridor, the hall, Six thin islands, cell clusters like stars in a grid, Layer two dissolves and reappears — that's the anatomical bid, This zone's where tau protein knocks first in disease, Know your Brodmann numbers, and you'll read the pathology with ease. [Verse 4] Molecular markers light the layers, calbindin, reelin call, Parvalbumin rings the borders, tracing the funnical wall, Grid cells fire in entorhinal space, mapping the world you walk, Every synapse a sentence in the brain's own silent talk, Calretinin marks the islands, scattered like a code, Wolfson layers whisper secrets down the pyramidal road, Stain the tissue, trace the circuit, watch the boundaries bend, Structure builds the story that the function will defend. [Bridge] Rat cortex is smooth, no folding, no fuss, Primate cortex buckles, gyri and sulci discuss, Human entorhinal splits into subfields, eight or nine deep, So a "medial" in mouse ain't a "medial" you keep — Nomenclature shifts species to species, don't assume it aligns, Cross-reference the atlas, or you'll botch the design. [Chorus] Peri, Post, Para — ring the hippocampal gate, Twenty-eight, thirty-four, transentorhinal slate, Rat brain, monkey brain, human brain don't match up straight, Read the region not the label, or you'll misread the data. [Outro] Trace the coronal slice, find the collateral sulcus mark, Perirhinal's lateral, entorhinal's medial, that's your landmark, Label the rat, label the human, compare the two side by side, Allocortex, periallocortex, neocortex — now you're oriented, ride.
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