The eye ball protrudes from the orbit with the contraction of

Options

A. Retractor bulbi muscles
B. Protractor lentis muscles
C. Levator bulbi muscle
D. None of the above

Answer

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks which muscle is responsible for the protrusion of the eyeball from the orbit.

2. **Identifying the Relevant Muscles**: There are several muscles associated with eye movement, including the rectus muscles (superior, inferior, medial, and lateral) and the oblique muscles (superior and inferior). However, we need to identify the specific muscle that causes protrusion.

3. **Identifying the Correct Muscle**: The muscle responsible for the protrusion of the eyeball is the **levator bulbi muscle**. This muscle is specifically designed to help in the movement of the eyeball forward.

4. **Location of the Levator Bulbi Muscle**: The levator bulbi muscle is a thin muscle located ventrally (towards the belly) to the eye and lies within the orbit. It is situated between the eye and the roof of the mouth.

5. **Innervation**: The levator bulbi muscle is innervated by the fifth cranial nerve, which is also known as the trigeminal nerve. This nerve plays a crucial role in the muscle's function.

6. **Function of the Muscle**: When the levator bulbi muscle contracts, it enlarges the buccal cavity (the space in the mouth) and causes the eyeball to protrude outward from the socket.

7. **Conclusion**: Therefore, the correct answer to the question is the **levator bulbi muscle**.

### Final Answer:
The eyeball protrudes from the orbit with the contraction of the **levator bulbi muscle**.

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