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CHAPTER 12 - EXOCRINE GLANDS
Histology Guide
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MICROGRAPH

NAME
EM 204 Salivary Gland
TISSUE
Sublingual Gland
(rat)
IMAGE SIZE
11,273 x 8,920 pixels
302 MB
FILE SIZES
41,309 KB (grayscale)
52,617 KB (color)
MAGNIFICATION
Unknown
PIXEL SIZE
??? nm
SOURCE
Stanley L. Erlandsen
Department of Genetics, Cell Biology and Development
School of Medicine
University of Minnesota
Minneapolis, MN

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EM 204 Salivary Gland

Sublingual Gland

Transmission electron microscopy (TEM) of the epithelium in a secretory acinus of the sublingual gland.

The sublingual gland is one of the major salivary glands located beneath the tongue. It has significantly more mucous than serous epithelial cells. Granules accumulate next to the lumen of

  • (green) - secrete highly-glycosylated proteins called mucins (mucins bound by water are known as mucus)
    • (yellow) - tightly packed granules that are lighter, low electron densities
  • (cyan) - secrete a protein-rich fluid
    • (black) - spherical granules that are darker, electron-dense

The cell at the base of the epithelium is not a stem/progenitor cell. The differentiated cells are still able to divide when necessary. With more extensive damage, stem/progenitor cells in the ducts can provide cells to the acini.

  • Nuclei (blue) / Nuclear Envelope (purple)
  • Golgi Apparatus - prominent in these secretory cells
  • Mitochondria (red)
  • Endoplasmic Reticulum (cyan)
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