Dictionary > Lacrimation

Lacrimation

Definition
noun, plural: lacrimations
The shedding of tears; crying; tearing
Supplement
Lacrimation refers to the shedding or secretion of tears. Tears are the fluid that flow from or appear in the eyes, especially due to emotions or irritations. Tears may be formed through crying, i.e. the shedding of tears in response to an emotional state. Crying may be due sorrow, awe, pleasure, elation, etc. Tears may also be generated as a means to clean and lubricate the eyes, particularly when there is an eye irritation. Tears may also be shed when yawning.
Humans have a precorneal film, which is a tear film that coats the eye. The precorneal film has three layers: (1) lipid layer, (2) aqueous layer, and (3) mucus layer. The lipid layer has meibum (oil) secreted from meibomian glands at the rim of the eyelids inside the tarsal plate. The aqueous layer has electrolytes, antibodies, lipocalin, lactoferrin, lysozyme, etc. that are secreted from the lacrimal gland. The mucus layer has mucins secreted from the conjunctival goblet cells.
The lacrimal glands secrete lacrimal fluid that flow into the canals that are connected to the lacrimal sac. From the sac, the tears, then drain through the lacrimal ducts into the space between the eyeball and lids. An excess of tears leads to the tears draining through the lacrimal duct onto the nasolacrimal duct, and finally into the nasal cavity.
Word origin: Latin lacrima (“tear”)
Synonym(s):

  • tearing
  • crying
  • lachrymation

See also:

  • crocodile tears syndrome
  • epiphora
  • tear
  • lacrimal gland
  • meibomian gland


  • You will also like...

    Mātauranga Māori and Science Collaboration
    Mātauranga Māori and Science

    Mātauranga Māori is the living knowledge system of the indigenous people of New Zealand, including the relationships t..

    Fossil trilobite imprint in the sediment
    Insects

    There are more species of insects than any other species combined. This surely illustrates that insects have the selecti..

    Structural depiction of catalase, an enzyme
    Protein Activity and Cellular Metabolism

    Proteins have a crucial role in various biological activities. Get to know how proteins are able to perform as enzymes, ..

    squirrel
    Animal Water Regulation

    Animals adapt to their environment in aspects of anatomy, physiology, and behavior. This tutorial will help you understa..

    "Cronopio dentiacutus", a prehistoric mammal (an illustration)
    Mammalian Ancestors

    Mammals are a diverse group of organisms, where most of them develop their offspring within the uterus of the mother. Ov..

    Water Cycle
    The Water Cycle

    The water cycle (also referred to as the hydrological cycle) is a system of continuous transfer of water from the air, s..

    Related Articles...

    No related articles found

    See all Related Topics