This 50-year-old patient underwent muscle biopsy to evaluate for cramps and myalgias.
What is the structure in the following figure?
A. Peripheral nerve
B. Muscle spindle
C. Blood vessel
Correct answer: Peripheral Nerve
Small fascicle of unremarkable appearing peripheral nerve included within the muscle biopsy.
The structure in the center of the image is a small peripheral nerve fascicle. Modified Gomori Trichrome stain highlights the myelin sheaths. In the cross sectional plane the axon wrapped by myelin can be seen as a central small dark green dot.
Note also: Small muscular artery in the upper right corner. Skeletal muscle fibers in the lower left half of the image
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