Which sequence correctly lists the GI wall structures from the serosal side toward the lumen?
Answer
Serosa, longitudinal muscle, myenteric plexus, circular muscle, submucosa, submucosal plexus, muscularis mucosae, mucosa
Explanation
The lecture gives the outer-to-inner sequence as **serosa**, **longitudinal muscle**, **myenteric plexus**, **circular muscle**, **submucosa**, **submucosal plexus**, **muscularis mucosae**, and **mucosa**. The other options omit structures or place layers in the wrong order. In particular, the mucosa faces the lumen, while the serosa is on the external surface. Learning the sequence also helps locate the two nerve plexuses accurately. **Key takeaway:** The mucosa faces the lumen, and the serosa is the outer covering.\n\n**Glossary:**\n- **Lumen**: The inner space through which GI contents pass.\n- **Serosa**: The outer epithelial covering of most of the GI tract.\n- **Submucosa**: Connective tissue layer beneath the mucosa.
Related Questions
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- Select ALL structures or features identified in the lecture as part of the GI tract’s organization.(intermediate)
- Which GI wall structure lies between the longitudinal and circular muscle layers?(basic)
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