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Type Ia sensory fiber
A type Ia sensory fiber, or a primary afferent fiber is a type of sensory nerve. It is a component of a muscle fiber's muscle spindle, which constantly monitors how fast a muscle stretch changes. (In other words, it monitors the velocity of the stretch).
==Function of muscle spindles==
For the body to keep moving properly and with finesse, the nervous system has to have a constant input of sensory data coming from areas such as the muscles and joints. In order to receive a continuous stream of sensory data, the body has developed special sensory receptors called proprioceptors. Muscle spindles are a type of proprioceptor, and they are found inside the muscle itself. They lie parallel with the contractile fibers. This gives them the ability to monitor muscle length with precision.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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