extrafusal การใช้

Acetylcholine is sensed by nicotinic acetylcholine receptors on extrafusal muscle fibers, causing their contraction.
Each alpha motor neuron and the extrafusal muscle fibers innervated by it make up a motor unit.
Extrafusal muscle fibers can be generated in vitro ( in a dish ) from pluripotent stem cells through directed differentiation.
Muscle spindles are encapsulated by connective tissue, and are aligned parallel to extrafusal muscle fibers, unlike Golgi tendon organs, which are oriented in series.
Thus, while motor efference commands to the facial muscles remain intact, sensory afference from extrafusal muscle fibers, and possibly intrafusal muscle fibers, is diminished.