Which of the following is a vestigial structure in man ?

Options

A. Caecum
B. Pinna of ear
C. Wisdom tooth
D. Muscles of glottis

Answer

**Step-by-Step Solution:**

1. **Understanding Vestigial Structures**:
- Vestigial structures are remnants of organs or parts that had a function in early ancestors but have lost most or all of their original function through evolution.

2. **Identifying Examples**:
- In humans, several structures can be considered vestigial. For example:
- The **sacrum** (siccum) is a part of the large intestine that still functions.
- The **pinna** of the ear helps in sound collection, but certain muscles associated with it may be considered vestigial.
- The **wisdom tooth** (third molar) is often cited as a vestigial structure because it was useful for our ancestors who had a different diet that required more chewing of tough plant material.

3. **Evaluating the Options**:
- Among the options provided, we need to determine which structure is vestigial.
- The **wisdom tooth** is not necessary for modern human diets, as we do not consume the same fibrous plant material that required such teeth for effective chewing.

4. **Conclusion**:
- Therefore, the correct answer is **C: Wisdom Tooth**, as it is a vestigial structure in humans.

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