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THYROID (Gr. Ovpoea3i'is, shield-shap...

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Originally appearing in Volume V26, Page 905 of the 1911 Encyclopedia Britannica.
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THYROID (Gr. Ovpoea3i'is, See also:shield-shaped, from Ovpeos, a large oblong shield, shaped like a See also:door, Obpa, and eiSos, See also:form) , in See also:anatomy, a See also:term applied (I) to the largest of the cartilages of the larynx (see See also:RESPIRATORY See also:SYSTEM), (2) to one of two See also:arteries which See also:lie near the thyroid See also:cartilage and gland (see ARTERIES), and (3) to a vascular ductless gland, which rests on the larynx and upper See also:part of the trachea (see DUCTLESS GLANDS). The thyroid gland is used in See also:medicine in two forms. Thyroideum siccum is a See also:light dull See also:brown See also:powder, prepared by drying the thyroid gland of a See also:sheep. Its See also:chief constituent is a proteid known as thyreoglobulin, the active principle of which contains 9.3% of See also:iodine and 0.5% of See also:phosphorus, and is known as iodothyrin or thyroiodin. The dried gland easily becomes See also:damp and deteriorates. Liquor thyroidei is a See also:pink turbid liquid made by macerating the fresh gland of a sheep with See also:glycerin and phenol. Thyroid gland administered to See also:man increases the See also:pulse See also:rate, causes increased and enfeebled cardiac See also:beat and leads to increased See also:metabolism, consequently excess of See also:urea, uric See also:acid and See also:phosphates arc excreted in the urine; it therefore reduces the See also:body See also:weight. Glycosuria develops from the inability of the body to ingest See also:glucose. Overdoses of thyroid cause rapid pulse, headache and vomiting, together with See also:diarrhoea and See also:pruritus, emaciation and weakness. These symptoms are known as thyroidism. Thyroid gland was introduced for the treatment of patients suffering from See also:goitre, See also:myxoedema and See also:cretinism, in which diseases it has been remarkably successful, cretins growing rapidly under the thyroid treatment and developing intelligence.

It has also been used in dwarfism, excessive obesity, See also:

psoriasis and scleroderma. When used in obesity an excess of nitrogenous See also:food should be taken to See also:balance the destruction of proteid. In certain forms of See also:insanity, See also:melancholia and See also:climacteric insanities it has given See also:good results. Full doses of thyroid are valuable in the prevention and See also:relief of eclampsia. It should not be given to patients suffering from exophthalmic goitre, for which an See also:anti-thyroid serum (antithyreoidin of Moebrus), which is the serum of thyroidectornized animals, has been introduced. Rodagen is a See also:white powder consisting of the dried See also:milk of thyroidectomized goats, mixed with 50 °A of milk See also:sugar. In exophthalmic goitre this preparation causes a reduction of the swelling and of the pulse rate, and an increase of body weight.

End of Article: THYROID (Gr. Ovpoea3i'is, shield-shaped, from Ovpeos, a large oblong shield, shaped like a door, Obpa, and eiSos, form)

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