. Text-book of anatomy and physiology for nurses. and arteries, thus in-creasing blood pressure. In the diseasecalled bronzing of the skin, or Addisonsdisease, these bodies are found to be changed. The Thyroid Body. The thyroid body is situated in the an-terior part of the neck. It has two laterallobes lying close to the trachea and connectedby a middle portion called the lobes are about one and one-fourthinches wide, and extend about two inchesupward along the sides of the larynx. The substance of the thyroid body is made up of closed sacs con-taining a thick semifluid substance
. Text-book of anatomy and physiology for nurses. and arteries, thus in-creasing blood pressure. In the diseasecalled bronzing of the skin, or Addisonsdisease, these bodies are found to be changed. The Thyroid Body. The thyroid body is situated in the an-terior part of the neck. It has two laterallobes lying close to the trachea and connectedby a middle portion called the lobes are about one and one-fourthinches wide, and extend about two inchesupward along the sides of the larynx. The substance of the thyroid body is made up of closed sacs con-taining a thick semifluid substance {colloid substance). They aresurrounded by many capillaries; the thyroid arteries being four innumber, the blood supply is very free. The function of the thyroid body is important but not well ex-plained. It is observed that the development of both mind andbody is arrested if the thyroid be absent, or if it does not itselfdevelop in childhood; this condition is known as cretinism. Degeneration or complete removal, in adult life, is followed by. Fig. 158.—The AdenalBody is seen restingUPON THE Kidney. PARATHYROID AND THYMUS BODIES. 223 excessive growth (but imperfect development) of connective tissueand skin elements, or myxedema. From these and other clinical observations it is evident that theinternal secretion of this body exercises an important influenceupon nutrition. It also stimulates cardiac action, and restrains atendency to obesity. Simple enlargement of the thyroid body constitutes goiter, which is saidto be frequent in certain countries where the drinking water contains muchlime. Median portion of crico-thyroid membrane Crico-tyroid muscle UTERAL LOBE OF THYROID BOD» THYROID ISTHMUS
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