PINEAL GLAND Small body attached to the roof of the 3rd ventricle of the brain Containing nerves that connect to the hypothalamus 10mm long, reddish and surrounded by capsule Becomes atrophy after puberty and calcified later in life Secrete the hormone melatonin
Function of Melatonin Coordinating circadian rhythm. As a timing signal to coordinate events the light-dark cycle in the environment. It increasing secretion of GnRH and sex hormones. Inhibits growth and development of sex organs before puberty.
THYMUS GLAND specialized organ of the immune system locate at upper part of the chest, behind the breastbone, and is made up of two lobes that join in front of the trachea. Secretes hormone called thymosin thymus produces and "educates" T- lymphocytes (T cells)
Function of Thymosin Its function is to transform lymphocytes (white blood cells developed in the bone marrow) into T-cells (cells developed in the thymus). These cells are then transported to various lymph glands, where they play an important part in fighting infections and disease.