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Intrafusal muscle fiber From Wikipedia, the free encyclopedia
A nuclear 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]
This article relies largely or entirely on a single source. (October 2020) |
Nuclear bag fiber | |
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Details | |
Identifiers | |
Latin | myofibra sacculiformis |
TH | H3.03.00.0.00013 |
Anatomical terms of microanatomy |
There are two kinds of bag fibers based upon contraction speed and motor innervation.
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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