---
title: "Auerbach's Plexus | Anatomy and Physiology I"
description: "Auerbach's plexus is the myenteric nerve network between gut muscle layers that controls smooth muscle motility in Anatomy and Physiology I."
canonical: "https://fiveable.me/anatomy-physiology/key-terms/auerbachs-plexus"
type: "key-term"
subject: "Anatomy and Physiology I"
unit: "Unit 23"
---

# Auerbach's Plexus | Anatomy and Physiology I

## Definition

Auerbach's plexus, or the myenteric plexus, is a nerve network in the gut wall that controls smooth muscle contractions. In Anatomy and Physiology I, it shows how the GI tract moves food without conscious control.

## What It Is

Auerbach's plexus is the myenteric nerve plexus of the gastrointestinal tract, a mesh of neurons and ganglia found between the longitudinal and circular layers of smooth muscle. In Anatomy and Physiology I, you usually meet it when the course shifts from basic digestive anatomy to the control of gut movement.

Its job is to coordinate motility, which means it helps set the rhythm and strength of contractions that move food, liquid, and waste through the GI tract. When one section of the intestine squeezes and the next section relaxes, that push-pull pattern is being organized through enteric nervous system activity, including Auerbach's plexus.

The plexus contains both excitatory and inhibitory neurons. Excitatory signals increase contraction in a stretch of smooth muscle, while inhibitory signals relax nearby muscle so the bolus can move forward. That balance matters because the gut does not just contract randomly. It has to generate coordinated waves, with enough force to move contents but not so much that everything spasms.

This plexus works as part of the enteric nervous system, which can operate independently of the central nervous system. Your brain and spinal cord can influence digestion, but the gut also runs its own local reflexes. That is why a meal can trigger organized motility even when you are not consciously thinking about it.

Auerbach's plexus is closely tied to peristalsis and to longer rhythmic patterns like the migrating motor complex, which happens between meals. If you picture the alimentary canal as a moving tube, Auerbach's plexus is one of the control centers that keeps the tube from being just passive muscle and turns it into an active conveyor system.

## Why It Matters

Auerbach's plexus shows up anytime the course asks how the digestive tract actually moves material, not just where the organs are located. It connects anatomy to function, which is a big part of Anatomy and Physiology I. You are not just naming a nerve network, you are explaining how smooth muscle layers work together to make digestion possible.

It also gives you a clean way to explain why the gut can keep working without direct conscious control. That idea comes up again when you compare the enteric nervous system with the broader nervous system, or when you trace how local reflexes differ from signals coming through the vagus nerve. If motility is disrupted, Auerbach's plexus helps explain symptoms like poor transit, spasms, or blockage-like movement problems.

In lab, diagram questions, or short-answer prompts, this term often appears in a structure-plus-function format. If you can place it between the muscle layers and connect it to coordinated contraction, you are already doing the kind of reasoning A&P asks for.

## Connections

### Enteric nervous system

Auerbach's plexus is one part of the enteric nervous system, the gut's local neural network. When a question asks how digestion can keep going without conscious thought, the enteric nervous system is the bigger system, and Auerbach's plexus is the motility-focused plexus inside it.

### Peristalsis

Peristalsis is the wave-like smooth muscle movement that pushes food through the GI tract, and Auerbach's plexus helps coordinate it. If you see a case or diagram about food moving from one organ to the next, think about how this plexus helps create the coordinated contraction and relaxation pattern.

### [Meissner's plexus](/anatomy-physiology/key-terms/meissners-plexus)

Meissner's plexus is the other major enteric plexus, but it is more associated with secretion and blood flow than muscle movement. A common way to separate them is to remember that Auerbach's plexus is deeper and tied to motility, while Meissner's plexus is more about the lining of the gut.

### [Gastric Secretions](/anatomy-physiology/key-terms/gastric-secretions)

Gastric secretions deal with the chemical side of digestion, like acid and enzymes, while Auerbach's plexus deals with motion. In an A&P question, these often appear together because digestion depends on both mixing food with secretions and moving that mixture forward.

## On the AP Exam

A quiz label, diagram, or short-answer item may ask you to identify Auerbach's plexus on a GI tract cross section, usually between the longitudinal and circular muscle layers. You may also need to explain what happens if it is damaged, such as weak or uncoordinated motility. On problem sets or case questions, the move is to connect the nerve plexus to symptoms like delayed gastric emptying, poor peristalsis, or pseudo-obstruction. If a prompt compares digestive control systems, use Auerbach's plexus as the example of local neural control inside the gut wall.

## Auerbach's plexus vs Meissner's plexus

These two plexuses are both part of the enteric nervous system, so they get mixed up a lot. Auerbach's plexus sits between the muscle layers and mainly controls motility, while Meissner's plexus is closer to the submucosa and focuses more on secretion and local blood flow.

## Key Takeaways

- Auerbach's plexus is the myenteric plexus, a nerve network between the two smooth muscle layers of the gastrointestinal tract.
- Its main job is to coordinate motility, especially the contractions that move food through the digestive system.
- It contains excitatory and inhibitory neurons, which lets the gut contract in a controlled, wave-like pattern instead of squeezing all at once.
- This plexus is part of the enteric nervous system, so the gut can run many reflexes without direct conscious control.
- When Auerbach's plexus does not function properly, movement problems like achalasia, gastroparesis, or intestinal pseudo-obstruction can show up.

## FAQs

### What is Auerbach's plexus in Anatomy and Physiology I?

Auerbach's plexus is the myenteric nerve plexus found between the longitudinal and circular muscle layers of the GI tract. In A&P I, you learn it as the control center for gut motility, not digestion by enzymes or absorption by the lining. It helps coordinate the muscle contractions that move contents forward.

### Where is Auerbach's plexus located?

It is located in the wall of the gastrointestinal tract, between the longitudinal and circular layers of smooth muscle. That location matters because it puts the plexus right where it can control contraction strength and timing. If you are labeling a diagram, think of it as the nerve layer built into the muscle wall.

### What is the difference between Auerbach's plexus and Meissner's plexus?

Auerbach's plexus controls motility, while Meissner's plexus is more involved in secretion and blood flow. A simple way to remember the difference is muscle versus mucosa. If a question is about peristalsis or contraction rhythm, Auerbach's plexus is usually the one you want.

### How does Auerbach's plexus affect digestion?

It does not break food down chemically, but it helps make sure food moves through the digestive tract in the right pattern. By coordinating smooth muscle contraction and relaxation, it supports peristalsis and other motility patterns. Without that coordination, the GI tract cannot move contents efficiently.

## Related Study Guides

- [23.1 Overview of the Digestive System ](/anatomy-physiology/unit-23/1-overview-digestive-system/study-guide/YrHMDXNIFoqC4F3W)

## About This Document

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