The Endocrine System

  • Ricardo V. Lloyd


Historically, the endocrine system was simply considered to be made up of a few glands that secreted their products directly into the bloodstream. These glands were sometimes referred to as “ductless glands.” Today the endocrine system is viewed as a very complex system of cells, tissues, and organs producing many hormones and amines. The endocrine system can be divided into two major categories, the diffuse or dispersed neuroendocrine system (DNS) and the nonneuroendocrine system. Most of the cells and tissues that are part of the endocrine system belong to the DNS, while a small group of cells that produce steroid and thyroid hormones have unique characteristics that set them apart from the neuroendocrine system.


Secretory Granule Endocrine Cell Neuroendocrine Cell Thyroid Follicular Cell Multiple Endocrine Neoplasia Syndrome 
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Copyright information

© Springer-Verlag New York Inc. 1990

Authors and Affiliations

  • Ricardo V. Lloyd
    • 1
  1. 1.Warthin-Weller Professor of PathologyUniversity of Michigan Medical CenterAnn ArborUSA

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