... system, 153 –162adrenal glands, 160–161parathyroid glands, 159 pineal gland, 161–162pituitary gland, 154 – 158 thyroid gland, 158 – 159 Index 2 25 Testis, 182–188course of sperm within, 188genital ducts ... 141, 142Thymus, 1 35, 141–142Thyroglobulin, 158 , 159 Thyroid follicles, 158 active and inactive, 159 Thyroid gland, 29, 158 – 159 Thyroid hormones, 158 synthesis and release of, 159 Thyroid stimulating ... ossification, 50 52 Endocrine cells, 109, 153 Endocrine glands, 25 26, 27, 29, 153 . See also Endocrine systemEndocrine organs, 154 Endocrine pancreas, 117Endocrine secretion, 153 Endocrine system, 153 –162adrenal...