Conjunctiva
- The conjunctiva is a thin, translucent membrane that covers the sclera of the eye, except for the cornea. It is composed of non-keratinized, stratified columnar epithelium, a stratified squamous epithelium with goblet cells, and stratified cuboidal epithelium. The structure is highly vascularized, with numerous microvessels.
- The conjunctiva secretes tears, albeit in smaller amounts than the lacrimal gland, and mucus that lubricates the eyes and prevents the entry of microorganisms.
- It is divided into two main components: bulbar and palpebral. The bulbar conjunctiva is thin, semitransparent, and colorless, covering the sclera up to the corneoscleral junction. The palpebral conjunctiva, on the other hand, is a thick and opaque red tissue.
- The conjunctiva plays several important functions, including protecting the soft tissues of the orbit and the eyelid, providing the tear film’s aqueous and mucous layers, supplying immune tissue, and facilitating independent globe movement.
- Conjunctivitis, also known as pink eye, is the inflammation of the conjunctiva and is a common eye condition.
Difference Between Sclera And Conjunctiva
The human eye is a crucial body part consisting of several structures, including the iris, pupil, cornea, sclera, and conjunctiva. The conjunctiva and sclera are two essential components of the eye’s defense system. The conjunctiva is a thin layer of tissue that lines the eye and eyelids and helps maintain a balanced tear film while also providing protection against foreign objects and infections. The sclera, on the other hand, is a sturdy connective tissue composed of collagen and elastin that surrounds and gives the eye its shape. The sclera connects to the cornea at the front of the eye and joins with choroidal tissue at the back of the eye via the optic nerve. Maintaining the integrity of both the conjunctiva and sclera are vital for the overall health of the eye, as abnormalities or inflammation can lead to significant disruptions in the ocular system.
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