[Verse 1] Slide under the hippocampus, there's a cortex wearing two coats, Split down the middle like a walnut, each half writes different notes, Medial side, MEC, stacked in bands so neat, Stellate cells in layer two, calbindin is their heartbeat, Lateral side, LEC, looser, more freeform, Reelin marks the fan cells, that's the chemical uniform, Border's not a fence, it's a gradient smear, But those two stains split the map from the souvenir, MEC handles distance, direction, the metric grid, LEC handles objects — what you touched, what you did. [Chorus] Medial for the map, lateral for the list, Calbindin, reelin — that's the border you can't miss, Grid cell logic north, object memory south, Say it with me, get the anatomy in your mouth: MEC is the ruler, LEC is the diary, Two lobes, one cortex, no need to worry. [Verse 2] Cross the species gap now, into the human brain, Rodent axes rotate, but the story stays the same, Maass, twenty-fifteen, drew the modern lines, Posteromedial pmEC where the grid signal shines, Navarro Schröder found it too, same year, same claim, Anterolateral alEC plays the object-recall game, So flip medial to posterior, lateral stays put mostly wide, The homolog isn't mirrored, it's rotated on its side, Same division, different geography, pmEC and alEC — learn the choreography. [Verse 3] Now stretch the axis — dorsoventral in the rat, Dorsal cells fire tight little grids, ventral ones go flat and fat, Scale expands as you travel ventral, fields grow wide and slow, In humans that's posterior to anterior, mirror the very same show, This whole arrangement's a hodology lesson, friend — That's the study of pathways, where connections start and end, Fine-grained maps up top, coarse spatial gist below, One gradient, two species, same anatomical flow. [Bridge] Witter and Moser, two-thousand-six, TINS laid the frame, Witter's crew in twenty-seventeen deepened the same game, Read them both, then take a page, compare and lay it flat, MEC beside pmEC, LEC beside alEC — chart that. [Chorus] Medial for the map, lateral for the list, Calbindin, reelin — that's the border you can't miss, Grid cell logic north, object memory south, Say it with me, get the anatomy in your mouth: MEC is the ruler, LEC is the diary, Two lobes, one cortex, no need to worry. [Outro] Dorsal to posterior, ventral to anterior glide, Map and list, folded into one cortical hide, Learn the hodology, trace where the pathways bend — Medial, lateral, gradient — that's the module's end.
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