BIOL123 Lecture Notes - Lecture 21: Mammary Gland, Salivary Gland, Holocrine
17 Jun 2018
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5.16 Classify exocrine glands based on anatomical structure and method of secretion, using
the terms unicellular and multicellular, and simple and compound.
• Structure:
o Unicellular (e.g. goblet cells)
o Multicellular
• Secretion method:
o Merocrine gland:
• E.g. salivary gland
• Secrete product from intact cells
o Apocrine gland:
• E.g. mammary gland
• Accumulate secretory product at the apical surface of each cell which
separates from the remainder to form a secretion in the lumen of the gland
• The cell then repairs itself
o Holocrine gland:
• E.g. sebaceous or oil glands
• Entire cells and heir secretions accumulate as the gland's secretory product
• Discharged cells are replaced by new ones
• Shape of duct:
o Tubular
o Alveolar
o Acinar
• Structure of duct:
o Simple or unbranched
o Compound or branched
•
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