| 词条 | Nuclear bag fiber |
| 释义 |
| Name = Nuclear bag fiber | Latin = myofibra sacculiformis | Image = | Caption = | Width = | Image2 = | Caption2 = }} A nuclear bag fiber is a type of intrafusal muscle fiber that lies in the center of a muscle spindle.[1] Each has a large number of nuclei concentrated in bags and they cause excitation of both the primary and secondary nerve fibers. 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 & velocity. See also
References1. ^{{cite journal|first1=I A |last1=Boyd|first2= M H |last2=Gladden|first3= P N |last3=McWilliam|first4=J|last4=Ward|title=Control of dynamic and static nuclear bag fibres and nuclear chain fibres by gamma and beta axons in isolated cat muscle spindels.|journal=Journal of Physiology|volume=265|issue=1|date=February 1977|pages=133–162|pmid=139469}} External links
2 : Nervous system|Muscular system |
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