STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY
Muscle spindle. Light micrograph of a section through a muscle spindle and associated nerve. Muscle spindles (smaller circlular structure) are skeletal muscle sensory organs that contribute to fine motor control and provide axial and limb position information to the central nervous system. They are involved in the sensation of position and movement of the body, this is called proprioception. A muscle spindle contains intrafusal fibers (orange). A small myelinated nerve (blue) is also present. Magnification: x200 when printed at 10 centimetres high.
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