Sensation of hearing is a result of

Options

A. Vibrations of ear ossicles
B. Nerve impulses from hair cells of organs of Corti
C. Vibrations in external auditory meatus
D. Vibrations in ear drum

Explanation

To solve the question regarding the sensation of hearing, we need to understand the processes involved in how we perceive sound. Here is a step-by-step breakdown of the solution:

### Step 1: Understanding Sound Transmission
Sound waves enter the ear and cause the eardrum (tympanic membrane) to vibrate. This is the first step in the process of hearing.

**Hint:** Think about how sound travels through different mediums before reaching the ear.

### Step 2: Role of Ear Ossicles
The vibrations from the eardrum are transmitted to three tiny bones in the middle ear known as the ossicles (malleus, incus, and stapes). These bones amplify the sound vibrations.

**Hint:** Remember the names of the three ossicles and their function in amplifying sound.

### Step 3: Vibrations to the Cochlea
The stapes, the last of the ossicles, connects to the oval window of the cochlea. When it vibrates, it creates waves in the fluid inside the cochlea.

**Hint:** Visualize how the movement of one bone leads to the next in the chain of hearing.

### Step 4: Hair Cells and Nerve Impulses
Inside the cochlea, there are hair cells that respond to the fluid waves. When these hair cells move, they generate nerve impulses. These impulses are sent to the brain via the auditory nerve.

**Hint:** Focus on the role of hair cells in converting mechanical vibrations into electrical signals.

### Step 5: Perception of Sound
The brain interprets these nerve impulses as sound, allowing us to perceive different pitches and volumes.

**Hint:** Consider how the brain processes different frequencies and intensities of sound.

### Conclusion
The sensation of hearing is primarily the result of nerve impulses generated from the hair cells of the organ of Corti in the cochlea.

**Final Answer:** The correct answer is the second option: nerve impulses from the hair cells of the organ of Corti.

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