The Wire That Runs the Whole Way Down

Aunt Priya had a tiny scar on the left side of her neck, just below the jaw, and Maya could not stop looking at it.

They were waiting in the recovery hallway, the kind with chairs bolted in rows and a vending machine that hummed. Aunt Priya had come in that morning to have the battery in her device replaced. A device, she had said, like it was a phone. Maya wanted to know exactly what it did and where, and Aunt Priya had only laughed and said, ask the doctor, she explains it better than I can.

The doctor came down the hall in green scrubs, holding a coffee, looking at her watch. Her name tag said Dr. Owens. She had the brisk, half-here way of someone with four more patients before lunch.

"Battery's good," she said to Aunt Priya. "You'll feel a little buzz every five minutes. You're used to that."

"What does it buzz?" Maya asked.

Dr. Owens glanced down like she had just noticed Maya existed. "A nerve," she said. "In her neck."

"Just her neck?"

"It's a neck nerve." Dr. Owens took a sip of coffee. "It calms the electrical storms that cause her seizures."

That was the part that did not fit. A neck nerve. Maya held the words and turned them over, and something about them was too small. A neck nerve should do neck things. It should not reach up into the brain and calm a storm there.

"How does a neck thing fix a brain thing?" she said.

Dr. Owens opened her mouth, then her pager went off, a flat electronic chirp. She read it. "It's a long nerve," she said, already half turned. "Longer than you'd think. Your aunt knows the rest." And she was gone down the hall, coffee and all.

Maya sat back down. Longer than you'd think.

She got out her phone, which her mother let her use for exactly this kind of thing, and typed the word the doctor had said on the consent form Aunt Priya had been holding. Vagus. The vagus nerve.

The first thing the screen told her was that vagus meant wandering. The same root as vagabond. They had named it after something that wanders.

The second thing made her sit very still.

It did not stay in the neck.

Maya read it twice to make sure. The vagus nerve started in the brainstem, the oldest deepest part, the part that ran the breathing you never thought about. Then it came down through the neck, past the little scar, and it did not stop. It went to the heart. It told the heart to slow down. It went to the lungs. Then it kept going, all the way down into the gut, into the stomach and the intestines, branching and branching like a river splitting into a delta.

One nerve. From the bottom of the brain to deep in the belly.

Maya looked up at Aunt Priya, who was reading a magazine, and tried to see it. The wire of it, running the whole way down inside her. The same single thread touching the place where she thought and the place where her heart beat and the place where she got hungry.

"Aunt Priya," she said. "When you feel the buzz. Where do you feel it?"

Aunt Priya thought about it. "My throat, mostly. Sometimes my voice goes funny for a second. And." She paused. "This is going to sound strange. Sometimes my stomach feels it too. Like it knows."

Maya's skin went tight all over.

Because that was it. That was the thing. The device buzzed one spot on her neck, and her stomach knew, because they were on the same wire. Not connected by some message passed along through other parts. The same nerve. The buzz traveled the brain end and the gut end of the same wandering thread.

She read more. The vagus did not just carry orders down. It carried news up. The belly was always talking to the head. The head was mostly listening.

And then the strangest line of all. Doctors were using this same nerve, this same neck spot, to treat things that seemed to have nothing to do with each other. Seizures, which were a brain thing. Depression, which felt like a mind thing. And rheumatoid arthritis, which was a swollen-joints thing, an inflammation thing, a body-on-fire thing. One nerve. Three problems that lived in completely different rooms of the body.

Unless they were not different rooms.

Maya stopped reading.

She thought about how when she was scared her stomach hurt. How when her stomach hurt she got gloomy. How when she was sick her thoughts went slow and grey. She had always thought of those as separate things that happened to line up. A bad day in three places at once.

What if they were never separate. What if there had always been a wire running between them, carrying the trouble back and forth, and nobody had drawn it on the diagrams in her science book because the diagrams cut the body into neat pages. Brain on one page. Heart on another. Stomach on another. As if you could.

"Maya," Aunt Priya said gently. "You've gone quiet. That's not like you."

"I'm thinking," Maya said, "about how you're all one piece."

Aunt Priya laughed, the magazine sliding off her knee. "Aren't we all."

"No," Maya said. "I mean it. There's a nerve. It starts up here." She touched the back of her own head, the soft place at the base of the skull. "And it goes here." Her hand on her throat. "And here." Her chest. "And all the way here." Her hand came to rest low on her own stomach. "The same one. The whole way down. And they fixed your brain by touching your neck because it was never just your neck."

Aunt Priya looked at her for a long moment. "The doctor took ten minutes to tell me that," she said. "And she had a diagram."

Down the hall a machine beeped, slow and steady, somebody's heart keeping time. Maya pressed her hand flatter against her stomach and waited, the way you wait at the start of a thunderstorm, to feel the next thing the body had to say.