The

tag is not necessary as it is used to define the most important heading on a webpage, which is not applicable here. You can format the subtitles using HTML markup, like this:

Conjunctiva:

The conjunctiva is a thin, transparent mucous membrane that covers the front surface of the eye, known as the bulbar conjunctiva, and lines the inside of the eyelids, known as the palpebral conjunctiva. It helps to protect and lubricate the eye.

Anatomy:

The conjunctiva consists of two layers: the epithelial layer and the underlying loose connective tissue layer called the substantia propria. The epithelial layer is composed of non-keratinized, stratified columnar epithelium, containing goblet cells that secrete mucus. The substantia propria contains blood vessels, lymphatics, and specialized immune cells.

Function:

The conjunctiva serves several important functions:

• Protection: It forms a protective barrier that covers the exposed surface of the eye, preventing foreign particles, microorganisms, and irritants from entering.
• Lubrication: It produces mucus and tears that help to lubricate the eye, keeping it moist and preventing dryness.
• Immunological defense: The conjunctiva contains lymphoid tissue and immune cells that play a role in the body’s defense against infection and inflammation.

Diseases and Conditions:

Various diseases and conditions can affect the conjunctiva, including:

• Conjunctivitis: Inflammation of the conjunctiva, commonly known as pink eye, often caused by bacterial or viral infection.
• Pterygium: A non-cancerous growth on the conjunctiva that can extend onto the cornea.
• Conjunctival tumors: Abnormal growths or tumors that can develop on the conjunctiva, such as conjunctival melanoma.