The movement of true vocal cords in man is controlled by cartilages

Options

A. Arytenoids
B. Cricoid
C. Thyroid
D. Both(1) and (2)

Answer

To answer the question regarding which cartilages control the movement of true vocal cords in humans, we need to analyze the functions of the relevant cartilages involved in the larynx.

### Step-by-Step Solution:

1. **Identify the Relevant Cartilages**: The main cartilages involved in the movement of the true vocal cords are the arytenoid, cricoid, and thyroid cartilages.

2. **Understand the Function of Arytenoid Cartilage**:
- The arytenoid cartilages are pyramid-shaped and are crucial for the movement of the vocal folds (true vocal cords).
- They allow the vocal folds to be tensed, relaxed, or approximated, which is essential for sound production.

3. **Examine the Function of Thyroid Cartilage**:
- The thyroid cartilage provides structural support for the vocal folds and plays a role in the production of the human voice.
- However, it does not directly control the movement of the vocal cords.

4. **Analyze the Function of Cricoid Cartilage**:
- The cricoid cartilage maintains airway potency and provides attachment for various muscles and ligaments.
- It also plays a role in the opening and closing of the vocal cords, but it does not directly control their movement.

5. **Conclusion**:
- The movement of the true vocal cords is primarily controlled by the arytenoid cartilages, as they are responsible for adjusting the tension and position of the vocal folds.
- Therefore, the correct answer to the question is that the movement of true vocal cords in man is controlled by the **arytenoid cartilages**.

### Final Answer:
The movement of true vocal cords in man is controlled by the **arytenoid cartilages**.