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CHAPTER 6 - NERVOUS TISSUE
Histology Guide
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MICROGRAPH

NAME
EM 231 Neuromuscular Junction
TISSUE
Skeletal Muscle
IMAGE SIZE
11,011 x 7,848 pixels
259 MB
FILE SIZES
71.6 MB (grayscale)
75.3 MB (color)
MAGNIFICATION
1,650x
PIXEL SIZE
5.425 nm
SOURCE
Junzo Kesaki
Yasuo Uehara
Department of Anatomy
Ehime University
School of Medicine
Shigenobu
Ehime, Japan

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EM 231 Neuromuscular Junction

Neuromuscular Junction

Scanning electron microscopy (SEM) of a neuromuscular junction, also called a motor end plate, after removal of surrounding connective tissue.

Neuromuscular junctions are specialized synapses where the terminal branches of an axon from a motor neuron contact a skeletal muscle cell to trigger muscle contraction.

  • (green) - bundles of myelinated axons from motor neurons in the spinal cord
    • Individual nerve fibers (blue) are seen where the connective tissue sheath has been removed
  • Presynaptic Terminals (,) - ramifications of the axon terminate in swellings embedded in shallow depressions on the surface of the muscle cells
    • Schwann Cells (,; yellow) - after losing its myelin sheath, the axon and its terminals continue to be covered by Schwann cells
  • Postsynaptic Membrane (motor end plate) - shallow depressions of extensively folded plasma membrane of the muscle cells (brown)

Small (red) are found between the muscle cells, with several (cyan) wrapped around them.

Courtesy of Yasuo Uehara, Department of Anatomy, Ehime University, School of Medicine, Shigenobu, Ehime, Japan.

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