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CHAPTER 4 - MUSCLE TISSUE
Histology Guide
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MICROGRAPH

NAME
EM 126 Smooth Muscle
TISSUE
Unknown
IMAGE SIZE
9,520 x 11,318 pixels
411 MB
FILE SIZES
93,017 KB (grayscale)
91,971 KB (color)
MAGNIFICATION
Unknown
PIXEL SIZE
2.941 nm
SOURCE
Stanley L. Erlandsen
Department of Genetics, Cell Biology, and Development
University of Minnesota
Minneapolis, MN

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EM 126 Smooth Muscle

Smooth Muscle

Transmission electron micrograph (TEM) of the wall of a muscular artery. The endocardium (red) can be seen at the top. The vessel wall has an inner circular layer (top) and an outer longitudinal layer (bottom) of smooth muscle.

  • Plasma Membrane (sarcolemma; dark green)
    • Caveolae (, ,) - small invaginations of the plasma membrane involved in the regulation of ion channels and calcium signaling.
  • (blue) / Nuclear Envelope (purple) - elongated with an ~3 µm .
  • (yellow) - found near one end of the nucleus in the of the cell.
  • (red) - many found near the ends of the nucleus.
  • Endoplasmic Reticulum (cyan)
  • - a network of thin (actin) filaments and thick (myosin) filaments. Difficult to resolve in this section.
  • - dark linear structures scattered throughout the cytoplasm. Anchors for thin filaments and intermediate filaments.
  • Cytoplasm (sarcoplasm; green)

Nerve fibers with many or only a single are seen within the smooth muscle. The non-myelinated axons (orange) are surrounded by processes from Schwann cells (tan).

Fibroblasts (light blue) are also seen around the nerves.

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