Which of the following statements are incorrect with regard to deglutition

Options

A. The first buccal phase of deglutition is voluntary
B. Larynx rises
C. Epiglottis closes off the trachea
D. None of these

Answer

**Step-by-Step Text Solution:**

1. **Understanding Deglutition**:
- Deglutition, commonly known as swallowing, is a complex reflex mechanism that involves the movement of food from the oral cavity into the esophagus and subsequently to the stomach.

2. **Evaluating the Statements**:
- We need to analyze each statement provided in the question to determine if any are incorrect regarding deglutition.

3. **Statement 1**: "The first buccal phase of deglutition is voluntary."
- This statement is **correct**. The buccal phase involves the conscious control of swallowing, where the food is pushed from the mouth into the esophagus.

4. **Statement 2**: "Larynx rises during swallowing."
- This statement is also **correct**. During the swallowing process, the larynx elevates to protect the airway and prevent food from entering the trachea.

5. **Statement 3**: "Epiglottis closes off the trachea."
- This statement is **correct** as well. The epiglottis acts as a flap that covers the trachea during swallowing to prevent food from entering the airway.

6. **Final Evaluation**:
- Since all three statements are correct, the option stating "none of these statements are incorrect" is the correct choice.

7. **Conclusion**:
- Therefore, the answer to the question is that all statements are correct, and the option indicating that none are incorrect is the right answer.