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    Injury of bodily tissue due to infection, trauma or neoplasm


Injury is damage or harm caused to the structure or function of the body caused by an outside agent or force, which may be physical or chemical.

Biological tissue is a group of cells that perform a similar function.The study of tissues is known as histology, or, in connection with disease, histopathology.The classical tools for studying the tissues are the wax block, the tissue stain, and the optical microscope, though developments in electron microscopy, immunofluorescence, and frozen sections have all added to the sum of knowledge in the last couple of decades.


Injury caused by external force, chemical, temperature extremes, or poor tooth alignment.



L-dopa. The single most effective anti-Parkinson drug, it is changed into dopamine in the brain.

Lewy body
A pink-staining sphere, found in the bodies of dying cells, that is considered to be a marker for Parkinson's disease.

An exaggeration of the forward curve of the lower part of the back, sometimes called sway-back.

Thin plastic or porcelain veneer produced in a dental laboratory and then bonded to a tooth.

Laughing gas
Nitrous oxide; odorless inhalation agent that produces relative analgesic (sedation); reduces anxiety and creates a state of relaxation.


Local anesthesia
Partial or complete elimination of pain sensation, in the immediate vicinity of its application or injection.

Operation to remove prolapsed disc - involves removal of part of a vertebra.

Lasegue sign
Pain in the back of the leg on flexing a patient's hip and knee and then extending the knee while the hip is flexed. Results from dural irritation, usually by a prolapsed disc.

Lesch-Nyhan syndrome
Results from congenital deficiency of hypoxanthine guanine phosphoribosyl transferase (HGPRT) - resulting in hyperuricaemia. Causes gout (even in a baby), mental retardation and choreoathetosis.

Letterer-Siwe Disease
A form of Histiocytosis-X

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