Ear ossicle incus is modified form of :

Options

A. Jugal bone
B. Quadrate bone
C. Articular bone
D. Hyomandibular bone

Answer

To solve the question "Ear ossicle incus is modified form of:", we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Function of Ear Ossicles**:
- Ear ossicles, which include the incus, malleus, and stapes, are small bones in the middle ear that play a crucial role in hearing. They transmit sound vibrations from the tympanic membrane (eardrum) to the inner ear.

2. **Identify the Options**:
- The options provided are:
1. Zugal bone
2. Quadrate bone
3. Articular bone
4. Hyomandibular bone

3. **Evaluate Each Option**:
- **Zugal bone**: This is a skull bone that forms part of the orbit. It is not related to the incus.
- **Conclusion**: Incorrect option.
- **Quadrate bone**: The incus is indeed derived from the quadrate bone, which is a bone found in the jaw of some vertebrates.
- **Conclusion**: Correct option.
- **Articular bone**: This bone is modified to form the stapes, another ear ossicle, not the incus.
- **Conclusion**: Incorrect option.
- **Hyomandibular bone**: This bone is found in some fish and amphibians and is not related to the incus.
- **Conclusion**: Incorrect option.

4. **Final Answer**:
- The incus is a modified form of the **quadrate bone**.