What is not true of human cochlea

Options

A. It is found in middle ear surrounded by endolymph
B. Scala vestibuli and scala tympani are components of cochlea
C. Cochlea is the site of nerve impulse generation
D. It is not concerened with maintenance of equilibrium

Answer

To determine what is not true of the human cochlea, we need to analyze each statement provided in the options. Here’s a step-by-step breakdown of the solution:

### Step 1: Analyze the First Statement
**Statement:** "It is found in the middle ear surrounded by endolymph."
- **Analysis:** The cochlea is actually located in the inner ear, not the middle ear. The middle ear contains the ossicles (malleus, incus, and stapes) that transmit sound waves. The cochlea is surrounded by perilymph, not endolymph. Therefore, this statement is incorrect.

### Step 2: Analyze the Second Statement
**Statement:** "Scala vestibuli and scala tympani are the components of cochlea."
- **Analysis:** This statement is correct. The cochlea consists of three main fluid-filled chambers: the scala vestibuli, scala media (which contains endolymph), and scala tympani. The scala vestibuli and scala tympani are indeed components of the cochlea.

### Step 3: Analyze the Third Statement
**Statement:** "Cochlea is the site of nerve impulse generation."
- **Analysis:** This statement is also correct. The cochlea contains hair cells that convert sound vibrations into nerve impulses, which are then sent to the brain for processing. Thus, it is the site where nerve impulses for hearing are generated.

### Step 4: Analyze the Fourth Statement
**Statement:** "It is not concerned with the maintenance of the equilibrium."
- **Analysis:** This statement is correct as well. The cochlea is primarily involved in hearing, while the vestibular system (which includes the semicircular canals) is responsible for maintaining balance and equilibrium. Therefore, this statement is true.

### Conclusion
After analyzing all the statements, the first statement is the only one that is not true regarding the human cochlea.

### Final Answer
The statement that is not true of the human cochlea is: "It is found in the middle ear surrounded by endolymph."

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