Which part is not included in Cochlear duct

Options

A. Reissner's membrane and tectorial membrane
B. Scala media
C. Macula of utricle
D. Tectorial membrane.

Answer

To determine which part is not included in the cochlear duct, we need to analyze the components of the cochlear duct and compare them with the options given.

### Step-by-Step Solution:

1. **Understand the Structure of the Cochlear Duct**:
The cochlear duct, also known as the scala media, is a part of the inner ear's cochlea. It is filled with endolymph and is crucial for hearing.

2. **Identify the Components of the Cochlear Duct**:
The cochlear duct includes:
- Tectorial membrane
- Basilar membrane
- Organ of Corti
- Scala media (another name for cochlear duct)

3. **Review the Options Provided**:
The options given are:
- Eastern membrane
- Pictorial membrane
- Scala media
- Macula
- Utricle
- Pictorial membrane (repeated)

4. **Analyze Each Option**:
- **Eastern membrane**: Not a standard term in anatomy related to the cochlear duct.
- **Pictorial membrane**: Likely a misspelling of "petrous membrane," which is not part of the cochlear duct.
- **Scala media**: This is another name for the cochlear duct, so it is included.
- **Macula**: Refers to a sensory structure found in the vestibule, specifically in the utricle and saccule, not in the cochlear duct.
- **Utricle**: Part of the vestibular system, not included in the cochlear duct.

5. **Conclusion**:
The part that is not included in the cochlear duct is the **macula of the utricle**. This structure is part of the vestibular system, which is separate from the cochlear duct.

### Final Answer:
The part that is not included in the cochlear duct is the **macula of utricle**.