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Nuclear bag fiber
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From Wikipedia, the free encyclopedia
(Redirected from Nuclear bag fibers)
Anuclear bag fiber is a type of intrafusal muscle fiber that lies in the center of a muscle spindle.[1] Each has many nuclei concentrated in bags and they cause excitation of the primary sensory fibers.[2]
There are two kinds of bag fibers based upon contraction speed and motor innervation.
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BAG2 fibers are the largest. They have no striations in middle region and swell to enclose nuclei, hence their name.
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BAG1 fibers, smaller than BAG2.
Both bag types extend beyond the spindle capsule.
These sense dynamic length of the muscle. They are sensitive to length and velocity.
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Retrieved from "https://en.wikipedia.org/w/index.php?title=Nuclear_bag_fiber&oldid=1165932853"
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