The Wire That Runs Everywhere

The waiting room had a fish tank with no fish in it, only a plastic castle and a lot of green light.

"Gran said they put a battery in her," Maya said. "In her chest. A little one."

"For her heart?" Soren asked.

"No. That's what's weird. It's for her seizures. Her head." Maya frowned at the empty tank. "Why would you put a battery in someone's chest to fix their head?"

Soren got up and read the panel bolted to the wall, the one with the diagram nobody ever looked at. He read it twice, the way he read things.

"Maya. Come look at this line."

The diagram was a person, see-through, with one nerve drawn in red. It started up in the brainstem, right at the bottom of the skull, and then it went down. Not a little way down. All the way down. It touched the throat. It wrapped around the heart. It spread out over both lungs. It kept going, down into the stomach and the guts, branching like a river coming apart into a delta.

"That's one nerve?" Maya said.

"It says one. The vagus nerve. It says vagus means wandering." Soren tapped the word. "Like a vagabond. Somebody named it because it wanders off everywhere instead of staying put."

Maya leaned close to the glass over the diagram. "So it's not a battery for her chest. The wire in her chest is talking to the nerve, and the nerve carries it up."

"Up to her brain."

"From her neck. Backwards." Maya stood up straight. "The battery buzzes the nerve down low, and the message goes up to her head and tells the seizures to stop."

Soren checked the panel again. "That's what it says. Stimulating it here treats seizures up there." He ran his finger along the red line, top to bottom, and stopped where it wrapped the heart. "But wait. If it's one wire, and it touches all of this, then buzzing it doesn't only reach the brain."

"It reaches the heart too."

"And the lungs. And the stomach." Soren looked at her. "How does the heart know the message was meant for the brain?"

Maya didn't answer right away. She put her own hand flat on her chest, then moved it up to the side of her throat, then to her stomach, tracing the line on herself.

"It doesn't," she said. "They all hear it. That's the whole point."

"What do you mean?"

"I mean this isn't a wire to your brain. It's a wire between all of them. Your brain and your heart and your gut are on the same line. Like a group call." She pressed her stomach. "When your stomach drops, when you're scared. When your heart pounds before a test. That's not your brain telling them separately. It's all of them on the same nerve at once."

Soren pulled out his notebook. He drew the see-through person and the one red line and then, next to the heart, he wrote heard it, and next to the lungs, heard it, and next to the gut, heard it.

"The panel says something else," he said, still drawing. "Down here at the bottom. It says the nerve is part of how the body turns down inflammation. When something's swollen or fighting an infection, the vagus can tell it to calm down."

"So one nerve does seizures and swelling."

"And your mood. It says depression too." Soren stopped drawing. "That's three completely different things. Your head, your feelings, and your sore knees. Doctors used to think those were separate."

Maya sat down slowly in the plastic chair. "They're not separate. They're all hanging off the same wire."

A nurse walked past with a clipboard and said, "You two doing okay?" and kept walking before either of them answered, which was fine, because neither of them had an answer that would fit in the hallway.

"Soren," Maya said. "When you get a stomachache from being nervous. Everybody says it's in your head."

"Right."

"It's not in your head. It's in the nerve. The stomach really is doing something. It's not pretend. It got the same message the head got." She was talking fast now. "Every time somebody told me I was making it up. I wasn't. There's a wire."

Soren looked at his own drawing, at the red line running from the brainstem all the way down through everything that matters, and he felt his stomach do the small tight thing it did when a large idea arrived.

"Feel that?" he said. "I just felt it. Right now. Thinking about it."

"Felt what?"

"My stomach. I had the idea in my head and my stomach answered." He put his hand over the exact place on the diagram, then over the same place on himself. "It's doing it right now. I can catch it doing it."

Maya laughed, delighted, and put her hand on her own stomach too, and they sat there, two kids in a waiting room feeling for a wire they couldn't see, catching the message as it ran.

A door opened down the hall. Gran came out with a small square bandage under her collarbone, walking slow, smiling at them.

"They turned it up a little," she said. "I felt it in my throat. A little flutter, right here." She touched the side of her neck.

Maya and Soren looked at each other.

"The neck," Maya said quietly. "Not the chest. She felt it in her neck because that's where the wire runs up."

Gran laughed. "You two look like I told you a secret."

"You did," Soren said.

Gran sat down between them to catch her breath, and when she did, Maya leaned her head against Gran's shoulder and stayed very still.