The type of vertabrae in the case of human is

Options

A. Acoelous
B. Procoelous
C. Amphicoelous
D. Heterocoelous

Answer

To determine the type of vertebrae found in humans, we need to analyze the different types of vertebral centra mentioned in the question. Here’s a step-by-step breakdown of the solution:

### Step-by-Step Solution:

1. **Understanding Vertebrae Types**:
- There are four types of vertebrae based on the morphology of their centra: Acelus, Procelus, Amphicelus, and Heterocelus.

2. **Definition of Acelus**:
- Acelus means "without concavity." In this type, both the anterior and posterior surfaces of the centrum are flat. This type is commonly found in mammals, including humans.

3. **Definition of Procelus**:
- Procelus vertebrae have a posterior surface that is convex and an anterior surface that is concave. This type is typically found in certain reptiles and is not present in humans.

4. **Definition of Amphicelus**:
- Amphicelus vertebrae have both anterior and posterior surfaces that are concave. This type is commonly found in fishes, not in humans.

5. **Definition of Heterocelus**:
- Heterocelus vertebrae have different shapes for the anterior and posterior surfaces, where the posterior surface is concave and the anterior surface is convex. This type is seen in some reptiles and is not characteristic of human vertebrae.

6. **Conclusion**:
- Based on the definitions and characteristics of the vertebrae types, the type of vertebrae found in humans is Acelus.

### Final Answer:
The type of vertebrae in the case of humans is **Acelus**.

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