Fenestra ovalis in frog is the

Options

A. the opening in the auditory capsule which seperates the middle ear from the inner ear
B. the air filled cavity of the middle air
C. the communication between the pharynx and the tympanic cavity
D. the external opening of the tympanic cavity which is covered by the tympanic membrane

Answer

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks about the fenestra ovalis in frogs, which is a specific anatomical structure.

2. **Identifying the Options**: The options provided are:
- A) The opening in the auditory capsule which separates the middle ear from the inner ear.
- B) The air-filled cavity of the middle ear.
- C) The communication between the pharynx and the tympanic cavity.
- D) The external opening of the tympanic cavity which is covered by the tympanic membrane.

3. **Analyzing the Fenestra Ovalis**: The fenestra ovalis is known to be a bony partition that separates the middle ear from the inner ear. It has a small window-like aperture.

4. **Evaluating Each Option**:
- **Option A**: This describes the fenestra ovalis accurately as it is indeed the opening in the auditory capsule that separates the middle ear from the inner ear.
- **Option B**: This refers to the tympanic cavity, which is incorrect as the fenestra ovalis is not the cavity itself.
- **Option C**: This describes the Eustachian tube, which connects the pharynx to the tympanic cavity, not the fenestra ovalis.
- **Option D**: This refers to the external auditory meatus, which is the external opening of the tympanic cavity, also incorrect in relation to fenestra ovalis.

5. **Conclusion**: Based on the analysis, the correct answer is **Option A**: "The opening in the auditory capsule which separates the middle ear from the inner ear."