The thin elastic membrane covering the sensory hair cells of the ear is known as

Options

A. Reissner's membrane
B. techorial membrane
C. basilar membrane
D. neuro-sensory membrane

Explanation

To answer the question about the thin elastic membrane covering the sensory hair cells of the ear, we can analyze the options provided:

1. **Resonance membrane**: This membrane, also known as the vestibular membrane, is located inside the cochlea of the inner ear. It separates the cochlear duct from the vestibular duct. Therefore, it does not cover the sensory hair cells.

2. **Tachoreal membrane**: This is a gelatinous membrane that indeed covers the sensory hair cells in the scala media of the cochlea. This makes it a strong candidate for the correct answer.

3. **Bacillar membrane**: The basilar membrane is a stiff structural element within the cochlea that separates the scala media from the scala tympani. It does not cover the sensory hair cells directly.

4. **Neurosensory membrane**: This term refers to membranes associated with the nervous system and sensory organs, but it is not specific to the ear or the covering of sensory hair cells.

After analyzing all the options, we conclude that the thin elastic membrane covering the sensory hair cells of the ear is known as the **Tachoreal membrane**.

### Step-by-step Solution:
1. Identify the options given: Resonance membrane, Tachoreal membrane, Bacillar membrane, and Neurosensory membrane.
2. Analyze each option:
- **Resonance membrane**: Not covering hair cells; separates cochlear and vestibular ducts.
- **Tachoreal membrane**: Covers sensory hair cells in scala media; likely correct.
- **Bacillar membrane**: Structural element; separates scala media and tympani.
- **Neurosensory membrane**: General term; not specific to ear hair cells.
3. Determine the correct answer based on the analysis: The **Tachoreal membrane** is the correct answer.