These occur throughout the conjunctiva, especially the plica semilunaris.
With ocular allergies, the lacrimal caruncle and plica semilunaris may be inflamed and pruritic (itchy) due to histamine release in the tissue and tear film.
The plica themselves are remnants of the fetal stage of development where the knee is divided into three compartments.
Iontophoresis and phonophoresis have been utilized successfully against inflammation of the plica and synovial capsule.
If both notes are the same, then the plica tone is the upper or lower neighbor, depending on the direction of the stem.
Other names for this trait include plica palpebronasalis and palpebronasal fold.
Often called a third eyelid or haw, it may be referred to in scientific terminology as the "plica semilunaris", "membrana nictitans" or "palpebra tertia".
Each moult is preceded by a period of immobility during which the cuticle is separated from the epidermis and the new cuticle is formed over plicae in the epidermis.
