Nasolacrimaliset

Nasolacrimaliset is a term that refers to the system of structures within the face responsible for the production, distribution, and drainage of tears. This intricate network is crucial for maintaining ocular health and comfort. The process begins with the lacrimal glands, located above the outer corner of each eye. These glands produce the watery component of tears, which lubricates the surface of the eye and washes away debris.

Tears spread across the eye's surface with each blink, forming the tear film. This film consists of three layers: an oily outer layer from the meibomian glands, a watery middle layer from the lacrimal glands, and a mucous inner layer from goblet cells. This film protects the cornea, provides a smooth optical surface, and contains antimicrobial agents.

Tear drainage occurs through small openings called puncta, located in the inner corners of the upper and lower eyelids. From the puncta, tears flow into the canaliculi, which lead to the lacrimal sac. The lacrimal sac is a small reservoir located in a groove on the side of the nose. From the lacrimal sac, tears are emptied into the nasolacrimal duct, which empties into the nasal cavity. This is why crying often results in a runny nose. Any disruption or blockage in this nasolacrimaliset can lead to various eye conditions, such as excessive tearing (epiphora) or dry eyes.