10 Useless Human Body Parts

Plica semilunaris is also called the third eyelid, located in the corner of our eye next to our tear duct. It’s a small folded fragment seen prominently when we move our eyes. The Plica semilunaris is said to help the eye maintain tear drainage and also allows free rotation of our eyes. Without the Plica semilunaris our eye would limited movements because the eyeball will be attached directly to the   conjunctiva. But even then its role is quiet restricted because of its tiny size. Moreover the existence of the Plica semilunaris is not absolutely necessary for our survival.