View 3 Hour Detailed Portland Weather Forecast for Today. Portland 4 â 7 Day Weather Forecast Summary: Heavy rain (total 37mm), heaviest during Mon afternoon. Warm (max 24Â°C on Mon afternoon, min 14Â°C on Tue night). Winds decreasing (fresh winds from the SSE on Sun night, light winds from the N by Mon afternoon).
noun, plural: spindles. (1) A collection of minute fibers composed of microtubules, which are prominent during cell division, as mitotic spindle or mitotic apparatus''. (2) A specialized innervated muscle structure involved in the reflex action and in proprioception, as muscle spindle. (3) A species of a poisonous shrub or small tree of the genus Euonymus, originally used for making spindles used for spinning wool. (4) An EEG waveform that occurs during sleep, as sleep spindle.
Definition. Muscle spindles 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.uscle spindles are small sensory organs, with an elongated shape. A muscle spindle contains intrafusal fibers. Those are several small, specialized muscle fibers. Those fibers are oriented parallel to the regular, power-producing extrafusal muscle fibers.