Statement A: The human skull is monocondylic.
Statement B: Ribs in humans are bicephalic.

Options

A. Only statement A is correct.
B. Only statement B is correct.
C. Both statement A and B are correct.
D. Both statement A and B are incorrect.

Answer

To analyze the statements provided in the question, we will evaluate each statement one by one.

### Step 1: Evaluate Statement A
**Statement A:** The human skull is monocondylic.

- The term "monocondylic" refers to having a single condyle. In the context of the human skull, we need to look at the occipital bone, which has a structure known as the foramen magnum.
- On either side of the foramen magnum, there are two occipital condyles. This means that the human skull has two points of articulation with the vertebral column.
- Therefore, the human skull is not monocondylic; it is dicondylic (having two condyles).

**Conclusion for Statement A:** This statement is incorrect.

### Step 2: Evaluate Statement B
**Statement B:** Ribs in humans are bicephalic.

- The term "bicephalic" refers to having two heads or two articulation surfaces. In humans, each rib has a head that articulates with the vertebrae.
- Specifically, the head of the rib has two facets: a superior facet and an inferior facet. These facets articulate with the bodies of the thoracic vertebrae.
- Additionally, the rib also has a tubercle that articulates with the transverse process of the vertebrae.
- Since the ribs have two articulation surfaces at their dorsal end, this means that they are indeed bicephalic.

**Conclusion for Statement B:** This statement is correct.

### Final Conclusion
- **Statement A** is incorrect (the human skull is dicondylic).
- **Statement B** is correct (human ribs are bicephalic).

Thus, the correct answer is that only Statement B is correct.

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