When I first started learning about my nervous system, I thought the sympathetic state was the “bad” one I needed to escape from. Like I just needed to get back to parasympathetic and everything would be fine.

That’s not how it works.

Your body has this entire network called the peripheral nervous system (PNS) that connects your brain and spinal cord to everything else – your muscles, your organs, your skin. It’s the communication highway that lets your brain know when you’ve touched something hot and sends the signal back to move your hand. Fast.

Here’s what I had to learn to make sense of what my body was doing.

The Two-Way Street

Your peripheral nervous system does two things:

Sensory (afferent) pathways bring information IN – this is hot, this is painful, this is pressure, this is movement.

Motor (efferent) pathways send commands OUT – move your hand, adjust your posture, contract this muscle.

These signals move remarkably fast because some nerves are wrapped in myelin, which speeds up transmission. And some reflexes don’t even need to reach your brain – they loop through your spinal cord and respond immediately. That’s why you jerk your hand away from heat before you consciously register pain.

Your body’s trying to protect you. It’s not waiting for permission.

Two Main Branches

The peripheral nervous system splits into two branches:

The Somatic System (Voluntary)

This is the part you consciously control. When you decide to type, kick a ball, or smile, that’s somatic nerves at work. They run from your spinal cord directly to your skeletal muscles.

Even though this system handles voluntary movement, it also manages reflexes – those automatic responses you don’t consciously control. When a doctor taps your knee and your leg kicks forward, that’s your somatic system showing you how quickly it can respond when it bypasses your thinking brain entirely.

The Autonomic System (Involuntary)

This is where it gets relevant to my work.

The autonomic nervous system (ANS) handles everything involuntary – your heartbeat, blood pressure, digestion, all the stuff that runs in the background whether you’re thinking about it or not.

The autonomic system uses a two-neuron chain. One neuron connects to a ganglion (a cluster of nerve cells outside your spinal cord), and a second neuron travels from that ganglion to your target organ. This setup allows for precise regulation – your heart can speed up or slow down, your blood vessels can constrict or dilate, your glands can increase or decrease secretion.

This is the system that kept me stuck in patterns I couldn’t understand until I learned how it actually works.

Sympathetic vs Parasympathetic: Not Good vs Bad

Here’s what I got wrong at first.

I thought:

• Sympathetic = bad, stressed, need to escape this
• Parasympathetic = good, calm, need to get back here

That’s oversimplified and honestly not helpful.

Sympathetic state prepares you for action. Heart rate speeds up, muscles get more blood, digestion slows. This is your “fight or flight” response, but it’s not inherently bad. You NEED this when you’re giving a presentation, catching a train, or dealing with actual threats.

The problem isn’t sympathetic activation. The problem is chronic sympathetic activation without returning to regulation.

Parasympathetic state helps you rest, digest, and repair, yet also is the freeze state. The same mechanics apply: heart rate slows, digestion enhances, your body focuses on maintenance rather than mobilization.

This comes from part of the polyvagal theory the dorsal vagal which has two tones: High Tone and Low Tone.

First to understand the dorsal vagal: this runs below your diaphragm to your gut and organs. It handles both rest/digest functions AND immobilization responses.

In its healthy form, this is where digestion happens, where your body maintains and repairs itself. But when threat is overwhelming and you can’t fight or flee, this same system creates shutdown – collapsed, numb, heavy, dissociated, that “playing dead” feeling. Gut issues, heaviness, fatigue, feeling “not here.”

To briefly recap:

High-tone, dorsal vagal (shutdown and collapse): This is when your body has given up trying to escape threat and just freezes instead. Collapsed, dissociated, that heavy feeling where you’re “not here.” Your body still slowed down, but it’s not the good kind of slow.

Low-tone, dorsal vagal (rest and digest): This is when your body feels safe enough to actually rest. You’re calm, connected, present. Your digestion works, your heart rate is steady, you can think clearly. This is the regulated state where repair and restoration actually happen.

Both are technically parasympathetic, but they feel completely different. One is safe rest. The other is body giving up or withdrawing.

Why Understanding The Functions of Peripheral Nervous System Matters

When I learned that my throat tightening before posting content was sympathetic activation literally trying to suppress my voice—not me being weak or scared—everything changed.

When I understood that my sudden exhaustion after pushing through wasn’t laziness but my body moving into dorsal shutdown because I’d ignored too many capacity signals—that changed how I approached my work.

The peripheral nervous system isn’t some abstract concept. It’s the network that’s constantly communicating whether you’re safe, whether you’re at capacity, whether you need to stop or can keep going.

And most of us were taught to override those signals instead of listening to them.

Sensory Receptors: What Your Body Is Tracking

Your skin, muscles, and organs are covered in receptors picking up specific information:

Mechanoreceptors detect pressure, vibration, texture changes – this is how you know when you’re touching something or being touched.

Thermoreceptors respond to temperature shifts. Hot, cold, the difference between them.

Nociceptors sense painful or damaging stimuli – sharp pricks, extreme heat, things that could hurt you.

Chemoreceptors monitor chemical changes, which matters for taste, smell, and internal regulation.

All of this sensory information travels through your peripheral nerves to your brain and spinal cord. Your central nervous system processes it and sends motor commands back out through the peripheral system.

It’s a constant feedback loop that most people aren’t consciously aware of until something goes wrong or they start paying attention.

What I’m Not Covering Here

I’m not going into disorders or how to “support your peripheral health” with nutrition tips and exercise recommendations. That’s not my expertise, and honestly, that advice often misses the point.

What I’ve found more useful is understanding how this system actually works so I can recognize what’s happening in my body. Not so I can fix it or optimize it, but so I can work with it instead of against it.

When you understand that your body’s signals – the throat tightening, the sudden fatigue, the urge to stop – are coming through this peripheral nervous system network, you stop seeing them as problems to overcome.

You start seeing them as information.

And that changes everything about how you move through your day, your work, your creative practice.