Which of the following sets of inner ear parts comprises of hair cells?

Options

A. organs of corti and vestibular apparatus
B. Crista ampullaris and organs of corti
C. mucula and organ of corti
D. tectorial membrane and ampulla

Answer

To solve the question "Which of the following sets of inner ear parts comprises of hair cells?", we will analyze each option provided and determine which parts contain hair cells.

### Step-by-Step Solution:

1. **Understanding the Inner Ear Structure**:
- The inner ear consists of several components that play a role in hearing and balance. The key structures include the cochlea (which houses the organ of Corti), the vestibular apparatus, the semicircular canals, and the crista ampullaris.

2. **Identifying the Options**:
- The options given are:
1. Organ of Corti and vestibular apparatus
2. Crista ampullaris and organ of Corti
3. Macula and organ of Corti
4. Tectoral membrane and ampulla

3. **Analyzing Each Option**:
- **Option 1: Organ of Corti and vestibular apparatus**:
- The organ of Corti contains hair cells that are responsible for hearing. However, the vestibular apparatus is primarily involved in balance and does not contain hair cells for sound transmission. Thus, this option is incorrect.

- **Option 2: Crista ampullaris and organ of Corti**:
- The organ of Corti contains hair cells for hearing. The crista ampullaris, located in the semicircular canals, also contains hair cells that help detect rotational movements. Therefore, this option is correct as both structures contain hair cells.

- **Option 3: Macula and organ of Corti**:
- The organ of Corti contains hair cells for hearing, but the macula is part of the vestibular system that helps maintain balance and does not contain hair cells for sound. Thus, this option is incorrect.

- **Option 4: Tectoral membrane and ampulla**:
- The tectoral membrane is a protective structure over the organ of Corti but does not contain hair cells itself. The ampulla is part of the semicircular canals and contains the crista ampullaris, which has hair cells. However, since the tectoral membrane does not contain hair cells, this option is incorrect.

4. **Conclusion**:
- The correct answer is **Option 2: Crista ampullaris and organ of Corti**, as both parts contain hair cells that are essential for the transmission of sound and balance.