Auerbach's plexus occurs

Options

A. Amongst podocuytes of Bowman's capsule
B. Inner to muscular interna
C. In muscular externa and made of nerves
D. Below dermis and made of muscles

Answer

**Step-by-Step Solution:**

1. **Understanding the Question:**
The question asks about the location of Auerbach's plexus, which is also known as the myenteric plexus.

2. **Identifying the Layers of the GI Tract:**
The gastrointestinal (GI) tract consists of four main layers:
- **Serosa** (outermost layer)
- **Muscularis** (below the serosa)
- **Submucosa** (below the muscularis)
- **Mucosa** (innermost layer)

3. **Focusing on the Muscularis Layer:**
The muscularis layer can be further divided into two types of muscle layers:
- **Circular muscle layer**
- **Longitudinal muscle layer**

4. **Locating Auerbach's Plexus:**
Auerbach's plexus is located between the circular and longitudinal muscle layers of the muscularis. It is an interconnected network of nerves that is responsible for regulating peristalsis (the movement of food through the GI tract).

5. **Evaluating the Options:**
- **Option 1:** Amongst podocytes of Bowman's capsule - Incorrect, as this relates to the kidney, not the GI tract.
- **Option 2:** Inner to muscular interna - Incorrect, as Auerbach's plexus is not located here.
- **Option 3:** In muscular externa and made of nerves - Correct, as this accurately describes Auerbach's plexus.
- **Option 4:** Below dermis and made of muscles - Incorrect, as this pertains to skin anatomy, not the GI tract.

6. **Conclusion:**
The correct answer is **Option 3: In muscular externa and made of nerves**.

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