Question

Which one is a vestigial organ in humans?

• A. Iris
• B. Malleus
• C. Pinna muscles
• D. Nasal epithelium

Answer 1

The correct option is C

Pinna muscles

The correct option is (C).

Explanation for correct option:

1. It is also called ear pinna.
2. Located in the outer ear on the cranial surface of pinna.
3. It does not have any function at present therefore, it’s a vestigial organ.
4. It contains auricular muscles that earlier helped in the amplification of sound

Explanation for incorrect options:

Option A:

1. Iris of the eye functions as a regulatory muscle in the eye.
2. It also regulates ciliary muscles controlling the amount of light going in the eyes.
3. It pivots light towards the retina.

Option B:

1. It is a bone in the inner part of the ear along with the incus and stapes.
2. It works as a channel connecting the auditory waves to the inner ear.

Option D:

1. It is a segment of the olfactory system.
2. Its functions include shielding the nasal cavity from any bombardment of infection-causing bacteria or viruses.
3. It also traps odors and contributes to smell by sending signals to the brain.

Final answer:

Hence, the ear pinna is a vestigial organ.