nuclear bag

They are static while the nuclear bag fibers are dynamic in comparison.

There is a 2:1 ratio of nuclear chain fibers to nuclear bag fibers.

There are two types of intrafusal muscle fibers: nuclear bag and nuclear chain fibers.

There are 3-9 nuclear chain fibers per muscle spindle that are half the size of the nuclear bag fibers.

Type Ia fibers connect to both nuclear bag fibers and nuclear chain fibers.

A nuclear bag fiber is a type of intrafusal muscle fiber that lies in the center of a muscle spindle.

It is done so because the dynamic nuclear bag fibers, which are innervated by the dynamic gamma motor neurons, receive Ia sensory innervation.

The dynamic type innervates nuclear bag fibers of muscle spindles, with collaterals to extrafusal muscle fibers.

Furthermore, the firing of dynamic gamma motor neurons removes the slack in dynamic nuclear bags, bringing Ia fibers closer to the firing threshold.

Gamma motor neurons innervate intrafusal muscle fibers of muscle spindles (nuclear bag and nuclear chain fibers).

Nuclear chain fibers are intrafusal fibers which, along with nuclear bag fibers, make up the muscle spindle responsible for the detection of changes in muscle length.

However, Golgi tendon organs differ from nuclear chain and nuclear bag fibers in that they are considered in series rather than in parallel to the muscle fibers.

Static gamma motor neurons innervate static nuclear bag fibers (bag2 fibers), a type of nuclear bag fiber and nuclear chain fibers.

Nuclear chain fibers' nuclei are organized in longitudinal columns which is where it gets its name from, whereas the nuclear bag fibers' nuclei are clumped in the midsection of the muscle spindle.

Dynamic gamma motor neurons innervate the dynamic nuclear bag fibers (bag1 fibers), another type of nuclear bag fiber smaller than the static nuclear bag fibers.

Secondary sensory endings of the muscle spindle are composed of type II sensory fibers that terminate on nuclear chain fibers and static nuclear bag fibers, but not dynamic nuclear chain fibers.

Muscle spindles can be made up of three different types of muscle fibers: dynamic nuclear bag fibers (bag1 fibers), static nuclear bag fibers (bag2 fibers), nuclear chain fibers, and the axons of sensory neurons.