Which GI wall structure lies between the longitudinal and circular muscle layers?
Answer
Myenteric plexus
Explanation
The **myenteric plexus**, also called **Auerbach’s plexus**, lies between the longitudinal and circular muscle coats. Its position is consistent with its close association with the muscle layers and GI motility. The submucosal plexus is within the submucosa, the muscularis mucosae lies between submucosa and mucosa, and the serosa covers the outside of most of the tract. **Key takeaway:** From outside inward, the myenteric plexus is positioned between the two main muscle layers.\n\n**Glossary:**\n- **Plexus**: A network of interconnected nerves.\n- **Longitudinal muscle**: Smooth muscle oriented along the length of the tract.\n- **Circular muscle**: Smooth muscle oriented around the tract’s circumference.
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