Sulcus subtarsalis

Sulcus subtarsalis is a feature of the human eye anatomy, specifically located in the conjunctiva, the clear tissue covering the white part of the eye and the inside of the eyelids. It is a horizontal fold found in the upper tarsal conjunctiva, which is the part of the conjunctiva that lines the inner surface of the eyelids.

Anatomy[edit | edit source]

The sulcus subtarsalis is a shallow groove or depression found in the upper tarsal conjunctiva. It runs parallel to the lid margin and is located approximately 2-3 mm from it. The sulcus subtarsalis is not a permanent structure but is formed when the eyelid is opened. It is more prominent in some individuals than in others.

The sulcus subtarsalis is significant because it is the site where foreign bodies and conjunctival secretions often accumulate. It is also the location where chalazion and styes, which are common eyelid disorders, usually develop.

Clinical significance[edit | edit source]

The sulcus subtarsalis is often examined during an eye examination to check for the presence of foreign bodies or signs of eye diseases. It can be visualized using a slit lamp, which is a microscope with a bright light used in eye examinations.

In some cases, the sulcus subtarsalis may become inflamed or infected, leading to conditions such as blepharitis, which is inflammation of the eyelid, or conjunctivitis, which is inflammation of the conjunctiva. Treatment for these conditions may involve cleaning the sulcus subtarsalis to remove any accumulated secretions or foreign bodies.