What are the five major endocrine glands?

pmid:15541569, doi:10.1016/j.mce.2004.07.018, research support, non-u.s. gov't, review, guck t ooi, neveen tawadros, ruth m escalona, animals, cell line, cell lineage, endocrine system, humans, pituitary gland / cytology*, pituitary gland / physiology, pituitary hormones / physiology*, pubmed abstract, nih, nlm, ncbi, national institutes of health, national center for biotechnology information, national library of medicine, medline