HB-070 · Digestive · Part
Digestive wall microstructure
Also called: gut wall layers, villi Paries tractus digestorii
Schematic 3D Classes 9-10 · Classes 11-12 Intermediate Draft - educator review
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Parts: mucosa; submucosa; muscularis externa; serosa
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About
The gut wall has four layers, and the small intestine lining is folded into villi for absorption.
- 📍 Where it is
- Walls of the oesophagus, stomach and intestines.
- 🧱 Structure
- Mucosa (with villi), submucosa (vessels and nerves), muscularis (circular and longitudinal muscle) and serosa.
- ⚙️ What it does
- Secretion, absorption, movement (peristalsis) and protection.
💡 Key facts
- Each villus has capillaries and a lacteal.
- Lacteals absorb fats into lymph.
- Microvilli form a brush border.
✗ The intestine lining is smooth inside
✓ It is folded into villi and microvilli.
📒 Words to know
- mucosa
- inner lining
- lacteal
- lymph vessel in a villus
- serosa
- outer covering
🏫 Related lessons
- Food and nutrition Classes 1-5
- Food, nutrition and health Classes 6-8
- Life processes Classes 9-10
Generic GayaGnan topic lessons. Check your own board's syllabus for the exact chapter.
🔎 Sources and credits
Catalog description: Layered cross-section of intestinal wall.
- OpenStax Anatomy and Physiology 2e, ch. 23 (digestive system) (accessed 2026-10-30)
- 3D models: BodyParts3D (DBCLS) and the Human Reference Atlas (HuBMAP), CC BY 4.0, with GayaGnan schematics. 3D model credits
For learning only. This site does not give medical advice, diagnosis or treatment, and it does not collect any health data.