Gamma motor neurons are associated with which property of the spindle?

Gamma motor neurons are associated with which property of the spindle?

• A. Sensitivity
• B. Elasticity
• C. Size
• D. Color

Answer: (A)

Gamma motor neurons tune how responsive a muscle spindle is to stretch by innervating the intrafusal fibers inside the spindle. When they fire, they tighten these fibers, increasing tension on the sensory endings so the spindle can detect even small changes in muscle length as the muscle moves. This adjustment keeps proprioceptive signaling accurate and the stretch reflex reliable during movement. If gamma input decreases, the spindle becomes slack and its sensitivity to stretch drops. So the property associated with gamma motor neurons is the spindle’s sensitivity to stretch. Elasticity, size, and color are not properties governed by these neurons in this context.

Gamma motor neurons tune how responsive a muscle spindle is to stretch by innervating the intrafusal fibers inside the spindle. When they fire, they tighten these fibers, increasing tension on the sensory endings so the spindle can detect even small changes in muscle length as the muscle moves. This adjustment keeps proprioceptive signaling accurate and the stretch reflex reliable during movement. If gamma input decreases, the spindle becomes slack and its sensitivity to stretch drops. So the property associated with gamma motor neurons is the spindle’s sensitivity to stretch. Elasticity, size, and color are not properties governed by these neurons in this context.