Abstract
Previous data on the composition of the periaxial fluid of muscle spindles have relied on indirect histochemical methods. We used a biotinylated hyaluronan-binding protein as a specific probe for the detection of hyaluronan in sections of human and rat limb muscles. Hyaluronan was identified in the axial and periaxial space of the muscle spindles as well as in the endoneurium and in the space in between individual axons. Hyaluronan was also present in the innermost layer of the spindle capsule in the A region and in all layers of the capsule in the B region.
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