2. on Growth and Development essential for normal growth and development especially skeletal growth and development a stimulate formation of dendrites, axons. myelin and neuroglia Cretinism a child without a thyroid gland growth and mental retardation2. on Growth and Development ◼ essential for normal growth and development ◼ especially skeletal growth and development. ◼ stimulate formation of dendrites, axons, myelin and neuroglia. ◼ Critinism ◼ A child without a thyroid gland ◼ growth and mental retardation