Archive image from page 1384 of Cunningham's Text-book of anatomy (1914). Cunningham's Text-book of anatomy cunninghamstextb00cunn Year: 1914 ( THE CEEVIOAL THYMUS VESTIGES. 1351 Groove for pulmonary artery Groove for left innominate vein Groove for vena cava superior Mediastinal urface It is impossible to say what should be the normal dimensions of the gland at the various ages. In some new-born babes it weighs as little as 2 or 3 gm., in others as much as 15-17 gm. At puberty it may be difficult to find, or may weigh as much as 40 gm. After the age of fifty it may require careful dissection
Archive image from page 1384 of Cunningham's Text-book of anatomy (1914). Cunningham's Text-book of anatomy cunninghamstextb00cunn Year: 1914 ( THE CEEVIOAL THYMUS VESTIGES. 1351 Groove for pulmonary artery Groove for left innominate vein Groove for vena cava superior Mediastinal urface It is impossible to say what should be the normal dimensions of the gland at the various ages. In some new-born babes it weighs as little as 2 or 3 gm., in others as much as 15-17 gm. At puberty it may be difficult to find, or may weigh as much as 40 gm. After the age of fifty it may require careful dissection to dis- cover, or may be quite large. When large it fills all the space available between the pleural sacs laterally and the back of the sternum and the pericardium and great vessels in front and behind; when small it is embedded in fat and fibrous tissue. The shape of the gland varies with its size and the age of the individual. In infants with short thoraces i,t is broad and squat; in adults with long thoraces it. is drawn out into two finger-like strands. The details of its shape are deter- mined by its size and by the structures upon which it is moulded, viz., the peri- cardium and the great vessels of the superior mediastinum and the root of the neck. One or both of its lobes may be connected by a strand of fibrous tissue to the tunica propria of the thyreoid gland. Blood and Lymph Vessels.—The blood supply of the thymus is effected through inconstant branches of the inferior thyreoid and internal mammary arteries. Its veins are irregular and join the inferior thyreoid, internal mammary, and innominate veins. Its lymph vessels are large and pass to glands close to the organ. Its nerves are minute and are derived from the vagus and sympathetic. The branches of the vagus descend directly to the thymus from about the level of the thyreoid cartilage; the sympathetic fibres run with the blood-vessels. The fibrous cajmtle of the thymus receives small irregular branches from t
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