Tags: Anatomical Structure.
A nuclear chain fiber is a specialized sensory organ contained within a muscle. Nuclear chain fibers are intrafusal fibers that along with nuclear bag fibers make up the muscle spindle responsible for the detection of changes in muscle length.There are 3–9 nuclear chain fibers per muscle spindle that are half the size of the nuclear bag fibers. Their nuclei are aligned in a chain and they excite the secondary nerve. They are static whereas the nuclear bag fibers are dynamic in comparison.
