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Crossed Extension Reflex

Note he isn't​ getting good extension to start but does demonstrate the opposite leg extension near the end of the testing. Onset: 28 weeks gestation Integration: 1- 4 months Position: Supine head in midline with LEs extended Procedure: Hold 1 leg at knee, maintaining this extremity in extension, apply firm pressure to the sole of the foot Response: Flexor withdrawl attempt on side of stimulus. Extension of the opposite lower extremity as if to push the examiner away. Practical example: Imagine stepping on a nail with your right foot. Naturally, the right leg will contract, via the flexor muscles, to withdraw the foot from the source of the pain. At the same time, the right leg's extensor muscles will relax to facilitate the process with minimal resistance. Simultaneously, the left leg will experience the exact opposite function and the leg will lock via the extensor muscle extension while the flexors relax. This is done to allow the left leg to maintain complete body weight. Baby is 5wks 5 days.