All of the below are true w. r. t organ of Corti except

Options

A. located on Reissner's membrane
B. pressing of stereocilia against tectonical membrane generates nerve impulses
C. impulses are carried to brain by cochlear branch of auditory nerve
D. it does not have any role in balancing

Answer

### Step-by-Step Solution:

1. **Understanding the Organ of Corti**: The Organ of Corti is a crucial structure located within the cochlea of the inner ear. It plays a vital role in the process of hearing.

2. **Identifying the Structure of the Cochlea**: The cochlea is shaped like a snail shell and consists of three main chambers:
- **Scala Vestibuli** (upper chamber)
- **Scala Media** (middle chamber)
- **Scala Tympani** (lower chamber)

3. **Membranes in the Cochlea**: The chambers are separated by membranes:
- **Reissner's Membrane** separates the Scala Vestibuli and Scala Media.
- **Basilar Membrane** separates the Scala Media and Scala Tympani.

4. **Location of the Organ of Corti**: The Organ of Corti is specifically located on the Basilar Membrane within the Scala Media, not on Reissner's Membrane.

5. **Function of the Organ of Corti**: The Organ of Corti contains hair cells with stereocilia that, when vibrated, generate nerve impulses. These impulses are transmitted to the brain via the cochlear nerve fibers.

6. **Evaluating the Statements**:
- **Statement 1**: "It is located on Reissner's membrane" - This is false because the Organ of Corti is located on the Basilar Membrane.
- **Statement 2**: "Pressing of stereocilia against the tectorial membrane generates nerve impulses" - This is true.
- **Statement 3**: "Impulses are carried to the brain by cochlear nerve fibers" - This is true.
- **Statement 4**: "It does not have any role in balancing" - This is true, as balancing is managed by the semicircular canals.

7. **Conclusion**: The incorrect statement regarding the Organ of Corti is that it is located on Reissner's membrane.

### Final Answer:
The statement that is not true about the Organ of Corti is: **It is located on Reissner's membrane.**

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