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Smooth muscle
The diameter of smooth muscle fibers varies in cross section because the fibers are cut at different locations along these spindle-shaped fibers. In addition, since the nucleus is located midway along the fiber, most cross sections of fibers will not pass through the nucleus. 1000x

Muscle fibers
The diameter of smooth muscle fibers varies in cross section because the fibers are cut at different locations along these spindle-shaped fibers. In addition, since the nucleus is located midway along the fiber, most cross sections of fibers will not pass through the nucleus. 1000x

Nuclei
The diameter of smooth muscle fibers varies in cross section because the fibers are cut at different locations along these spindle-shaped fibers. In addition, since the nucleus is located midway along the fiber, most cross sections of fibers will not pass through the nucleus. 1000x

Sarcolemma
The diameter of smooth muscle fibers varies in cross section because the fibers are cut at different locations along these spindle-shaped fibers. In addition, since the nucleus is located midway along the fiber, most cross sections of fibers will not pass through the nucleus. 1000x