College of Massage Therapists of British Columbia (CMTBC) Practice Exam

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What does the crossed-extensor reflex help to support?

Improvement of muscle strength
Prevention of injury to muscles
Body stability during withdrawal of the injured limb
Reduction of pain signals

The correct answer is: Body stability during withdrawal of the injured limb

The crossed-extensor reflex is a crucial neurological response that helps maintain body stability during the withdrawal of an injured limb. When a painful stimulus occurs, such as stepping on a sharp object, the affected limb quickly withdraws away from the stimulus. To maintain balance and prevent falling, the muscles on the opposite side of the body become activated, allowing that limb to stabilize the body, thus providing support and balance during the withdrawal process. This coordination between limbs is essential, especially when rapid movements are required to react to potential threats or injuries. While the crossed-extensor reflex indirectly contributes to muscle strength and the prevention of injury, its primary function centers on maintaining stability and balance during dynamic movements. It does not directly reduce pain signals, as that is a different physiological response involving pain pathways.