4.22 Endocrine systemOnline version endocrine system by Jorge Arizpe 1 Hypothalamus 2 Pituitary gland 3 Thyroid gland 4 Thymus gland 5 Adrenal glands 6 Pancreas 7 Pineal gland 8 Parathyroid glands 9 Heart 10 Kidneys 11 Digestive tract 12 Testes 13 Ovaries