Lacrimal gland

"Tear production" is not a specific molecule or receptor but rather a **physiological process** primarily mediated by the **lacrimal gland**, an exocrine structure located above each eyeball. The main function of the lacrimal gland is to secrete **lacrimal fluid**—a complex mixture of water, ions, proteins such as lactoferrin and lysozyme, immunoglobulin A (IgA), growth factors like EGF and TGF-beta, and other components—onto the ocular surface[1][3]. This fluid forms the aqueous layer of the tear film that lubricates, protects against infection, nourishes the cornea/conjunctiva, and facilitates wound healing[1][3][6]. Tear secretion is regulated by neural pathways involving sensory input from the cornea/conjunctiva triggering reflexes via parasympathetic fibers from the facial nerve[3]. The balance between basal secretion and drainage maintains ocular surface health; disruption can lead to dry eyes or excessive tearing[4][6]. Because "tear production" refers to a physiological output rather than a discrete molecular target such as a receptor or enzyme—and because it encompasses multiple cell types (acinar cells for water/protein secretion; plasma cells for IgA) as well as complex regulatory mechanisms—it should not be considered a canonical therapeutic target. Instead, interventions typically address underlying dysfunctions in this system using lubricating agents ("artificial tears") rather than drugs targeting specific molecules. In summary: "Tear production" is not itself a molecule/receptor but describes secretory activity mainly attributed to the **lacrimal gland**. For structured data purposes regarding drug targets or molecular biology databases, this entry would be flagged as incorrect since it does not correspond to an individual protein/gene/receptor/enzyme but instead denotes an organ-level function[1][3][6].

Other names

Tear glandMain lacrimal glandOrbital lacrimal glandPalpebral lacrimal gland

Lubrication and moisture replacement for deficient tear production