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spindle (spin´dәl) a pin tapered at one end or both ends, or something with this shape.
the thin, tapering figure occurring during metaphase of cell division, composed of microtubules radiating from the centrioles and connecting to the chromosomes at their centromeres. Called also mitotic spindle.
muscle spindle.

mitotic spindle spindle (def. 2).

muscle spindle a mechanoreceptor found between the skeletal muscle fibers; the muscle spindles are arranged in parallel with muscle fibers, and respond to passive stretch of the muscle but cease to discharge if the muscle contracts isotonically, thus signaling muscle length. The muscle spindle is the receptor responsible for the stretch or myotatic reflex.

Diagrammatic cross-section of a muscle spindle showing the intrafusal fibers and afferent and efferent endings.

Diagrammatic cross-section of a muscle spindle showing the intrafusal fibers and afferent and efferent endings.

sleep spindles bursts of activity of a particular waveform in the electroencephalogram in light or early sleep.

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