Which of the following bones are cartilaginous

Options

A. Exoccipital and frontoparietal
B. Exoccipital and spenethmoid
C. Exoccipital and parasphenoid
D. Frontoparietal only

Explanation

To determine which of the following bones are cartilaginous, we need to analyze the options provided.

### Step-by-Step Solution:

1. **Understand Cartilaginous Bones**:
- Cartilaginous bones are those that are primarily made up of cartilage rather than bone. Cartilage is a flexible connective tissue that is not as rigid as bone.

2. **Review the Options**:
- The options given are:
- a) Occipital and frontoparietal
- b) Occipital and spinatmoid
- c) Occipital and paraspinoid
- d) Frontoparietal only

3. **Identify Each Bone**:
- **Occipital Bone**: This is a bone located at the back of the skull. It is primarily a bony structure, not cartilaginous.
- **Frontoparietal Bone**: This refers to the frontal and parietal bones, which are also primarily bony structures.
- **Spinatmoid Bone**: This term seems to be a misspelling or misinterpretation. If it refers to the "sphenoid bone," it is also a bony structure.
- **Paraspinoid Bone**: This is not a commonly recognized term in human anatomy.

4. **Conclusion**:
- Based on the analysis, none of the options provided consist of bones that are primarily cartilaginous. The occipital, frontoparietal, sphenoid, and any other mentioned bones are primarily bony structures.

5. **Final Answer**:
- None of the given options contain cartilaginous bones.