180592

THE SECOND REFEX ARC

ATTACHED TOWARD THE END OF THE SPINDLE,

THAT INNERVATES THE INTRAFUSAL FIBERS THEMSELVES

IS MADE UP OF THE ALPHA SENSORY NEURON LOOPED AROUND THE CENTRAL REGION OF THE MUSCLE SPINDLE

THAT INNERVATES THE EXTRAFUSAL FIBERS. THE ALPHA LOOP IS THE REFLEX ARC FOR THE STRETCH REFLEX.

OR GAMMA LOADING, THIS INCREASES TENSION OF THE INTRAFUSAL FIBERS INCREASES THE PROPRIOCEPTOR'S SENSITIVITY TO THE RATE OF LENGTHENING