Which one is a bone of skull? 

Options

A. Atlas
B. Femur
C. Tibia
D. Pterygoid

Answer

To determine which one of the given options is a bone of the skull, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Structure of the Skull**: The skull is a bony structure that forms the head in vertebrates. It consists of bones that protect the brain and support the facial structures.

2. **Identify the Parts of the Skull**: The skull is divided into two main parts:
- **Cranium**: This part encases the brain.
- **Mandible**: This is the lower jawbone.

3. **Know the Number of Bones in the Skull**: In humans, the skull is made up of 22 bones, which include:
- **8 Cranial Bones**: These protect the brain.
- **14 Facial Bones**: These form the structure of the face.

4. **Examine the Options**:
- **Atlas**: This is a bone in the cervical vertebrae, not part of the skull.
- **Femur**: This is the thigh bone and is not part of the skull.
- **Tibia**: This is the bone in the lower leg, also not part of the skull.
- **Pterygoid**: This is a bone that forms part of the palate in many vertebrates and is considered a bone of the skull.

5. **Conclusion**: The correct answer is **Pterygoid**, as it is a bone associated with the skull.

### Final Answer:
The bone of the skull from the given options is **Pterygoid**.

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