Lactation pp 49-102 | Cite as

The Mechanisms of Milk Secretion

  • Margaret C. Neville
  • Jonathan C. Allen
  • Christopher Watters

Introduction and Overview

Milk secretion occurs in all mammals, the presence of mammary glands being one of the important criteria distinguishing this class from all others. Although the location and external form of the mammary gland differ from one species to another, the mechanisms of milk production are remarkably similar. Milk is produced by epithelial cells which line the mammary alveoli and is stored in the alveolar lumina adjacent to these cells. During ejection, the milk is forced from the alveoli by contraction of surrounding myoepithelial cells and exits through ductules into ducts which drain several clusters of alveoli. In the human, small ducts coalesce into 15 to 25 larger ducts which dilate into small sinuses as they near the areolus. These ducts open directly on the nipple (see Chapter 2 for a more extensive discussion of the anatomy of the human mammary gland). In other animals, the ducts may empty into a single primary duct or a cistern which in turn is drained by a single teat canal. These structures may provide additional milk storage, particularly in dairy animals.

Keywords

Citrate Folate Cytosol Phenylalanine Lysozyme 

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Copyright information

© Plenum Press, New York 1983

Authors and Affiliations

  • Margaret C. Neville
    • 1
  • Jonathan C. Allen
    • 1
  • Christopher Watters
    • 2
  1. 1.Department of PhysiologyUniversity of Colorado School of MedicineDenverUSA
  2. 2.Department of BiologyMiddlebury CollegeMiddleburyUSA

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