Which statement is wrong :-

Options

A. Centrum is absent in ATLAS
B. Prezygapophysis is absent in 2nd cervical vertebrae
C. Post zygapophysis is present in ATLAS
D. Coronoid fossa is found in humerus

Answer

To determine which statement is wrong regarding the skeletal system, particularly focusing on the vertebrae and the humerus, we will analyze each statement provided in the question.

### Step-by-Step Solution:

1. **Understanding the Centrum in Atlas**:
- The first statement claims that the centrum is absent in the atlas. The atlas is the first cervical vertebra and is known for its unique structure that supports the skull. It does not have a centrum, which is the central mass of a typical vertebra. Therefore, this statement is **correct**.

2. **Prezygapophysis in the Axis**:
- The second statement states that the prezygapophysis is absent in the second cervical vertebra (the axis). The axis does have prezygapophysis, which are the projections that articulate with the atlas. Thus, this statement is **incorrect**.

3. **Post-Zygapophysis in Atlas**:
- The third statement claims that the post-zygapophysis is present in the atlas. The atlas does have a post-zygapophysis, which is located at its posterior part. Therefore, this statement is **incorrect**.

4. **Coronoid Fossa in Humerus**:
- The fourth statement mentions that the coronoid fossa is found in the humerus. The coronoid fossa is indeed a depression located above the trochlea of the humerus, making this statement **correct**.

### Conclusion:
Based on the analysis:
- The **wrong statement** is the second one: "prezygapophysis is absent in the second cervical vertebra." This statement is incorrect because the axis does have prezygapophysis.