[Verse 1]
Nineteen fifty-seven, Henneman tapped the wire,
Watched the tiny soldiers answer first, before the choir,
No shuffling of the deck, no random dice to roll,
The smallest neuron always takes the opening role.
[Chorus]
Small before tall, that's the size principle call,
Low resistance, quick to spark — first to answer, first of all,
Add a unit, that's recruitment, speed the drum, that's rate,
Henneman's order, never random, always straight.
[Verse 2]
Picture a neuron like a narrow garden hose,
Less room inside, so a little current grows,
High input resistance means it needs the smallest nudge,
Volts times resistance — that's the physics, don't you budge,
They hit threshold early, fire before the rest,
Driving slow red fibers, built to never quit or rest,
Fatigue-resistant marathoners, steady in the crowd,
While the heavyweight battalions wait, patient, unbowed.
[Verse 3]
Force is not a light switch, just flipping on or off,
Two dials turn it louder — don't you dare scoff:
Recruitment adds more hands onto the rope that's being pulled,
Rate coding speeds the drummer till the rhythm's full,
First the small battalion marches, steady, in with ease,
Then the fast, the big, the hungry join when force demands to seize
Something quicker, something fiercer, bursts of power, sharp and loud,
Fast to tire, first to quit, but they electrify the crowd.
[Chorus]
Small before tall, that's the size principle call,
Low resistance, quick to spark — first to answer, first of all,
Add a unit, that's recruitment, speed the drum, that's rate,
Henneman's order, never random, always straight.
[Verse 4]
Cortex doesn't micromanage, doesn't pick each cell,
It just shouts "push harder" and the order rings the bell,
EMG electrodes listening to the hum beneath the skin,
Reading recruitment's rising wave, the story hidden within,
Does M1 code the force, or does it code the aim?
Scientists keep arguing, waving Henneman's name,
But one quiet law keeps ticking underneath it all,
Small before tall, forever standing tall.
[Verse 5]
When disease unweaves the pattern, ALS steals the slow ones first,
Reversing nature's order, quenching what seemed never to thirst,
Clinicians watch the twitches, map which fibers fall away,
Henneman's law in reverse becomes a warning, come what may,
Rehab science leans on order, training small to big with care,
Building endurance, then the power, climbing rung by rung the stair,
Every therapy, every protocol, still bows to the same old rule,
Size decides the story, in the body's quiet school.
[Bridge]
Indefatigable — a word for never running dry,
Slow fibers wear that crown, they do not say goodbye,
Fast ones flash like sprinters, burning hot then bowing out,
Size writes the whole schedule, no confusion, no doubt.
[Outro]
Small before tall, that's the size principle call,
Ohm by ohm, the quiet ones recruited first of all,
Recruitment, rate coding, two hands on the dial,
Henneman's tidy order, filed away, worthwhile.