Medical Dictionary Definitions A-Z List
Medical Dictionary Definitions A - Z - «L»:
Labrum: In medicine, a ring of fibrocartilage (fibrous cartilage) around the edge of the articular (joint) surface of a bone. The term labrum is used in anatomy to designate a lip, edge, or brim. Plural: labra.
The glenoid labrum is a ring of fibrocartilage that runs around the cavity of the scapu...
Labyrinth: The maze of canals in the inner ear.
The labyrinth is
the portion of the ear that is responsible for sensing
balance. Inflammation of the
labyrinth (labyrinthitis) can be accompanied by vertigo....
Labyrinthitis: Inflammation of the labyrinth, the system of intercommunicating canals and cavities within the inner ear responsible for sensing balance. Labyrinthitis may be accompanied by the sudden onset of a feeling of vertigo triggered by head or body movement together with feelings of nausea an...
LAC encephalitis: LaCrosse encephalitis, one of the main types of encephalitis caused by an arbovirus in the US. An arbovirus is a virus that is arthropod-borne (carried by a mosquito, tick or another kind of arthropod). The arbovirus infects and inflames the brain.
LAC encephalitis was first found...
Laceration: A cut.
All that is required to care for most cuts is to wash them with soap and water and keep them clean and dry. Putting alcohol, hydrogen peroxide, and iodine onto cuts can delay healing and should be avoided. Seek medical care early if you think that the cut may need stitches. Any d...
Lacrimal: Pertaining to tears, as in lacrimal gland (tear gland). From the Indo-European dakru meaning a tear (from a weeping eye) which gave rise to the Greek dakry and the Latin lacrima....
Lacrimal gland: A small almond-shaped structure that produces tears. The lacrimal gland is located just above the outer corner of the eye.
The lacrimal gland is part of the lacrimal apparatus, the system that forms tears, conveys them through the lacrimal (tear) duct to the eye, and drains the tear...
Lacrimation: The production, secretion, and shedding of tears. From the Indo-European dakru meaning a tear (from a weeping eye) via the Latin lacrima....
LaCrosse encephalitis: One of the main types of encephalitis caused by an arbovirus in the US. An arbovirus is a virus that is arthropod-borne (carried by a mosquito, tick or another kind of arthropod). The arbovirus infects and inflames the brain.
LaCrosse (LAC) encephalitis was first found in a 4...
Lactase: Enzyme that breaks down the milk sugar
lactose into glucose and galactose. Persons with a deficiency of lactase in the gut can develop abdominal cramping and diarrhea after ingesting milk products....
Lactase deficiency: Not enough of an enzyme called lactase in the small intestine to digest lactose, a prominent
component of milk and most other dairy products. Lactose is sometimes
also used as an ingredient in other foods, so anyone with lactase
deficiency should check food labels with care. ...
Lactate dehydrogenase: (LDH) An enzyme that catalyzes the conversion of lactate to pyruvate. This is an important step in energy production in cells. Many different types of cells in the body contain this enzyme. Some of the organs relatively rich in LDH are the heart, kidney, liver, and muscle.
Lactation: The process of milk production. Human milk is
secreted by the mammary glands, which are located within the fatty
tissue of the breast. The hormone oxytocin is produced in response to
the birth of a new baby, and it both stimulates uterine contractions
and begins the lactation process....
Lactic acidosis: Acidosis (too much acid in the body) due to the buildup of lactic acid in the body. Lactic acidois occurs when cells make lactic acid (from glucose) faster than it can be metabolized. The key signs of lactic acidosis include unusually deep and rapid breathing, vomiting, and abdomina...
Lactobacillus: A bacterium normally found in the mouth, intestinal tract, and vagina. Lactobacillus can also live in fermenting products, such as yogurt. Humans appear to have a
symbiotic relationship with this bacteria. Lactobacillus has been with us so long that some types have become an importan...