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dymas the thymus is a by lobed lymphoid
organ situated in the superior
mediastinum and often extends above in
the root of the neck and below in the
upper part of the anterior mediastinum
it is usually prominent in children and
gradually increases in size till puberty
when it weighs about 40 grams thereafter
it atrophies and gets infiltrated by
fibers and fatty tissue it is related
anteriorly to sternohyoid and
sternothyroid muscles and sternum and
posteriorly to the pericardium arch of
iota and its branches left
brachiocephalic vein and trachea it
secretes a hormone called thymosin which
plays an important role in the
development of immunity of the body