What is the conjunctiva?

The conjunctiva is accurately defined as a mucous membrane that lines the eyelids. This membrane is crucial for eye health, as it serves to protect the eye by providing a barrier against pathogens and foreign particles. Additionally, it helps to keep the surface of the eye moist by secreting mucus and tears, which are essential for lubrication. The conjunctiva is also involved in immune responses, making it a vital component of the ocular surface.

In contrast, the other options do not describe the conjunctiva. An infection does not define the conjunctiva but may affect it, such as in conjunctivitis. The outer layer of the skin refers to the epidermis, which is unrelated to the conjunctiva’s role or function. The membrane surrounding the brain is known as the meninges, which also differs significantly from the structure and purpose of the conjunctiva.